I think I'll disagree with this just a little bit. Don't forget the timeframe -- it's only been a few months since his mom died, and it's been two weeks since Rory actually met Eddie and company. In that time he's gone from thinking he's being shipped off to this guy who abandoned his mother before he was born and who his mom apparently cared so little about that she never talked of him, to finding that his father didn't even know he existed, to finding his dad actively lied to him, along the way finding that both his mother and grandmother knowingly lied to him as well.
The whole foundation for his world's been ripped out and replaced, parts of it several times. He's scared, off balance, and desperately needs the people that he's supposed to rely on, the people who've turned out to be actively unreliable, to step up, fess up, and give him some solid footings he can trust.
'Course, the fact that his behaviour's understandable and reasonable doesn't make him particularly sympathetic -- he desperately needs a good smack. But, then, so does Eddie, and his grandmother needs a good whack with a two-by-four. Eddie's deception's not that unreasonable, since he assumed Rory was straight (a good guess unless you know you're in the middle of a piece of internet fiction) and would probably be at least unsettled knowing his dad was married to another guy, and wanting to build some relationship before dropping that bomb's not out of line. Grandma, though... no real excuse for what she's doing, not that I can see.