Long Islanders are condemning a new popcorn brand for committing the cardinal sin of improper preposition use.

For every Long Islander who takes pride in their roots, it is essential to understand that stating someone lives or was born “in” Long Island is as incorrect as using utensils to eat a slice of pizza.

The correct preposition to use when referring to an island is “on,” which is why “Born On Long Island” Popcorn has been a subject of ridicule since its introduction in December.

One Reddit user expressed their frustration, stating, “You can hail from, stand for, be on, live near, be close to, reside by, be far from, stay away from, or be adjacent to Long Island, but you can never be in Long Island! Are we clear on that?!”

“People live ON islands — Bond villains live IN Islands,” said another.

“How to make sure your target market never buys your product,” declared a Reddit user.

Some said the name is just a clever way to sell the snack ,which costs between $5.99 and $8.99 for five ounces.

“It was a marketing strategy, and it was intentional,” a Redditor said. “People started ranting on social media, bringing out the pitchforks. Meanwhile, now everyone wants popcorn.”

The popcorn is made by Viviwoods, Inc., a Westbury-based producer of organic, gluten-free foods, which filed to trademark the name last May.

Viviwoods did not respond to requests for comment.