In case it's not already obvious from what so many others have already pointed out, it's not that "everyone one (sic) this forum hate[s] aerobars", it's that most of the people in the Road Cycling forum ride in groups, and a cyclist using aerobars in a group ride compromises the safety of that group.

You can argue all you want about whether or not aerobars are inherently squirrlier (sp?) than drop bars, and I might even be willing to accept to proposal that stability when riding on aerobars can be learned... But there is absolutely no arguing the fact that when you are riding on the aerobars, your hands are 4-6" (at least) away from the brake levers, and I'm sorry, I don't know any group rider who's comfortable in a paceline behind or in front of some schmuck whose brakes are that inaccessible. Just like it's uncool to show off your no-hands riding skills in a paceline; it's just plain uncool to compromise the safety of other riders.

Now, when you're riding all by yourself, aerobars are the shiznit. Hell, I'd certainly have a totally aero TT bike in my stable (if I had enough room in my apartment to have a stable). But I'd never bring it on a group ride. I care too much about other people.