Gg, mango
It's shouldn't be considered right to treat anyone like dirt. Even if they've done something dumb. If it become a huge problem, then go deal with it. If you can't find a heart for someone's mistake(s) then holy stuff, I feel sorry you. But if you don't care how you treat people then honestly you're a lost cause, and again, I'm sorry. Sure, having idiots forget around in any place can be annoying. But what makes you better by calling them out on it by saying, "You guys are a bunch if unfunny richard heads!" This only makes you more of an starfish. But then again, this is just my view on life. If you got your mind set on that being mean to someone just because they did something stupid is right, then by all means, forget off.
also I pretty sure those guys would be glad to ditch you when the time comes, i.e. they're not really friends, just desperate for company.
I would have no problem if they ditched me in end. It just tells me, like you said, they're not real friends or nice people. Why hold onto a relationship like that?