(a) is more just observed behavior, but yes, the other 3 happen... Way too often. Especially "You only got that grade because you're almost the only girl in class."

With A, it's more than hey we've got a common intrest. I've have them go out of their way to fake intrest in my other stuff, or to belittle my other intrests by trying to act like they know more than I do. And they just won't back off if I don't show intrest in them, they just keep badgering me, then move on to getting all touchy even though I hardly know them. It's fine that we have a common interest and they're interested, it's an entirely other thing when they treat it like I have no choice but to be interested in them because of it. I can't explain exactly how that comes across rather than just general intrest, but it does happen sometimes.

Jason, you're a good friend of mine, and I'm very touchy with my friends. So I don't mind. ^_^ I think some of these guys see me out with my friends and assumes this means they can hang all over me.

*laughs*
No kidding. If I were only ever around my friends, I'd forget this crap existed too.