I think the perception that cyclists are playing hobby in the road is worse when it's a group of fancy pants cyclists. No one commutes in a group, right?
But here's the thing... it shouldn't matter. Not all motorists are commuting somewhere important. (or anywhere for that matter) I know many owners of classic cars just go out "cruising". How dare they get in my way while enjoying their hobby! Never mind that it's legal.
Even so, I would not wear a roadie clown suit. That just looks silly no matter where you're going!