Where's the Respect?

My junior year I decided to take Anatomy and Physiology instead of Chemistry. I thought I would put it off until my senior year, so I would have an easier class to look forward too. Not too much homework.
The first day of school didn't start out too well. The day prior I had gotten a molar extracted and it went terribly wrong. I go to my first three classes and they seem alright and the kids in the classes weren't too bad. Then Came 4th period.
I walk into class 3 minutes late with a peanut butter and jelly. The kind of peanut butter and jelly that had the perfect amount of peanut butter. Not too much, not to little, spread out evenly on one side of the white bread. And the jelly, was grape. The best kind of jelly to put with peanut butter. Grape jelly isn't like strawberry or raspberry where you get the seeds stuck in your teeth and then it takes hours to get all the little seeds hiding in your teeth out. The kids in the class were decent. All juniors, so of course I felt superior since I am a senior. Mr. Falcone gave us an activity to do, and I unconsciously put the tempting and magnificent peanut butter and jelly down. Next thing I know, Some Junior, Whom I have never met before, is eating my peanut butter and jelly. He knows that its mine and yet still proceeds to eat it. I wasn't mad, more aggravated and confused.
Now everyday that I come into 4th period, he is always asking me for some of my food and if its not asking then he's helping himself to it. Within the last week, we have gotten to know each other and now I don't mind as much, but where's the respect?