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Most of the time, when Shark Tank fans watch the popular reality show, they focus on the people who are pitching and whether they get a deal. However, between the times they’ve gotten mad, when they have been accused of breaking rules, or when they become emotional, it is often the sharks that garner headlines. Unfortunately, there have also been headlines about Daymond John being a “nightmare,” Robert Herjavec facing a disturbing lawsuit, and Lori Greiner making the other shark furious.
While it isn’t uncommon for Shark Tank business relationships to sour, rumors about the sharks not getting along have also always garnered the most attention. With that in mind, it is surprising that so few fans know that Robert recently publicly stated that people should “beware” Mark Cuban.
Robert Herjavec Perfectly Explained Why People Should “Beware” Mark Cuban
During the second season of Shark Tank, Mark Cuban made several appearances on the show. Mark then became a staple of virtually every episode from the show’s 3rd to 16th seasons. As a result, Robert Herjavec got to spend a lot of time working with Mark on the show.
As Shark Tank fans are likely to already know, it seemed very clear at times that Mark and Robert didn’t see eye-to-eye. In fact, there were multiple times when the two business leaders seemed to be very annoyed with one another for various reasons.
Given their sometimes explosive relationship, it is always interesting to learn what Mark and Robert have said about each other. One perfect example of that is the time that Robert told his fans why they should “beware” Mark.
Recently, Robert Herjavec uploaded a truly remarkable video to his TikTok account.
Ranking The Shark Tank Sharks, According to Screen Rant |
|
---|---|
Shark |
Rank |
Daymond John |
#6 |
Barbara Corcoran |
#5 |
Robert Herjavec |
#4 |
Lori Greiner |
#3 |
Kevin O’Leary |
#2 |
Mark Cuban |
#1 |
Throughout Mark’s public appearances over the years, it has often been notable that he wore T-shirts instead of the suits that most business leaders don. With that in mind, it is notable that Robert began the video by stating that people should “beware” people like Mark.
Beware the man in the T-shirt, not the man in the suit.
To further make it clear that Robert’s warning was about Mark, he went on to explain that he learned that lesson from observing his Shark Tank co-star.
As his video continued, Robert spoke about when he first got the chance to meet Mark.
In August 2023, CNBC published an article about how Mark Cuban first became incredibly wealthy. After revealing that Mark almost went broke at one point, CNBC reported that Mark co-founded a company called AudioNet that was sold to Yahoo in 1999 for $5.7 billion.
As Robert explained in the TikTok video, he expected Mark to look a certain way because of how much money he was worth at the time.
“So before I met Mark, I mean, the guy was worth at the time, three or four billion. He’s worth what? $6 billion now. I thought he would come in and, you know, be better dressed. He came in wearing a T-shirt and jeans. “
As his video continued, Robert revealed that he asked Mark a pretty shocking question.
In March 2025, Forbes reports that Mark Cuban is worth a staggering $5.7 billion.
Not only that, Robert asked Mark a question that easily could have offended him.
So I’m sitting down with Mark one day and I say, ‘Mark, with all due respect, why do you dress like a slob?’
Instead of getting angry at Robert’s question, Mark responded with an incredible show of power and confidence.
In his TikTok video, Robert remarked that Mark explained to him that he can dress however he wants to.
Mark looks at me and he says, ‘Robert, because I can.’
Even though Robert is far more successful than the vast majority of people, he made an incredible admission in the TikTok video. To his credit, Robert admitted that it took him a while to truly understand what it means to be as powerful as Mark is.
“I didn’t quite get it at the time, but over the years, I’ve realized Mark is never the one selling. Every room he goes into, people are selling him. Here’s what I’ve learned over sixteen years. You walk into a room and there’s 20 people sitting there and 20 of them are wearing a suit and tie. And there’s one person in the back of the room wearing a T-shirt. That’s the one with the power because that person worked their a** off to get to a position to wear whatever they want to wear.”
Robert Herjavec Has Admitted That Mark Cuban Taught Him An Important Business Lesson
Before Robert Herjavec and Mark Cuban met, both of them were already very successful. Despite that, Robert admitted that getting to talk to Mark had taught him how to be a better business leader.
On October 20th, 2024, Robert uploaded his video to his YouTube channel. That video was titled “10 Things I Learned from Mark Cuban That Changed My Life!”
During the nearly 25-minute video, Robert speaks at length about all the things that he had learned from spending so much time with Mark.
One of the most interesting parts of that video is when Robert told a story about how Mark taught him about being confident in business.
“So I’m sitting next to Mark and I say, Mark, when you go into a meeting, do you expect to win always? He’s like, ‘Yes. 100% of the time.’ And I’m like, ‘Well, what if it doesn’t work out? What what if you lose? What if you risk too much?’ And you know what he says to me? ‘No. It’s going to work out.'”
Robert then explained that learning how confident Mark was affected him deeply. “It really shook me, his level of confidence. I used to think I was a pretty confident guy. When I met Mark, he just took it to a whole another level. He changed my entire trajectory.”

Shark Tank
- Release Date
-
August 9, 2009
- Network
-
ABC
- Showrunner
-
Mark Burnett