I swear, I've seen it! The guy who runs the Bulk Reef Supply YouTube account commented back on one of his videos saying they're jerks and I just saw it again on a thread about what kind of corals people hate most and someone put "clownfish... Even though they aren't even corals, I just hate them" and someone replied in agreement! It raised red flags for me hahaha I'm still looking forward to getting a couple
Should check out the BRS guys 120 gal clown fish Harlem tank....he put nothing in it(well LR and cleaning crew too) but a bunch BTAs and 30 clowns.
Clowns can be moderately aggressive, and they can gang up on each other. Like in the 120 I just mentioned they were black and whites, one of them had a little bit of orange on it's nose so it stood out and was getting picked on (had to be removed for its own safety.)
Especially while trying to figure out who gets to be the girl. Dominance stuffs...and you do NOT want to end up purchasing two girls by accident. It wont end well. Always go for the medium to smallest ones in a school of all about the same size. Some people try crossbreeding(with some success) not sure I'd recommend that for a beginner, get the same species.
They can also get territorial especially after they claim an anemone. (mine trys to bite my hand if I get near hers)
Tomatoes and Marroons are the two worst for this.
But over all clowns arnt hated....
They are a great beginner fish...that is pretty easy to keep, is active around the tank(meaning some fish just hang in a corner or in a hole and your lucky to see at feeding time)
and the whole anemone hosting relationship is just cool...seriously.
OH and they are pretty easy to breed...should you ever wanna get into that.