Exactly. No amount of free booze or weed is worth dealing with fatties.  Don't want to cause trouble for yourself? Fine, it's understandable you don't want to cause waves your first year, but you don't have to associate with fatties. And you shouldn't.  They grope you at the gym? Report them for harassment and reckless behavior. They flirt with you? "Sorry, you're just not my type." They try to get you to join for booze? Sorry, not interested in consuming empty calories today. Obnoxious skinny shaming? "I think she looks fine. I'm definitely attracted to healthy sized girls like that, and I know many guys who would agree."  You don't have to bully or be an obvious dick to rebuff their efforts. Just don't put up with any bullshit.