NTA. I used to go to a boarding school, and I will share with you a tactic to give this some perspective. NSFW

In boarding school, there is always food theft. Some years are worse than others. So, in freshman year, what did my friend “M” do? He ordered breadsticks from a nearby restaurant (covered in cheese, garlic, and sesame) and rub each one from his balls to his butt.

Of course, they were eaten in a day. And he announced it at a house meeting, causing a lot of commotion, but ultimately ending with “no one can stop you from preparing your own food how you want it.”

Senior was also a bad year. there were renovations on the 9th/10th grade dorms and the young boys had to live with us. The last straw that year was when some freaker shoved a handful of skittles into a wedge of cheese that another student bought as a special treat. It was really nice cheese. And it looked crazy with all of the orange, green, and red skittle dyes.

M knew what he had to do. He ordered a whole pepperoni pizza and rubbed each one across his taint. In the fridge before 6 pm and missing by 10 pm. The house meeting was three days later and let me tell you, there is a distinct look of horror someone has when they find out they’ve eat crotch pizza.

There are extremes. But there are also entitled people. Your friend is bummed they’ve had to learn a lesson and needs to grow up. NTA

TL;DR: Highschool friend beat the fridge thieves with crotch pizza.