If I watched the episode, I probably would've picked that up. The stereotypes bother the hell out of me too. Alas! But yeah, I get what you mean. If the only gay character in a show turned out to be the bad guy, I'd be pretty leery about it too...

I don't understand why people are trying to excuse it, though. You're (general you, not you-anon) allowed to like Sherlock! It would just be nice if you acknowledged that those segments are racist instead of trying to write them off or justify them. Holy shit, guys? Ignorance sucks and is never justifiable.