While I don't harbor the same hatred towards Bronies I used, as I can't bring myself to give two fucks about actively disliking things anymore, the "love and tolerance" always grinds my gears. While I'm not saying /all/ of them do this, I've seen a fair share of bronies use it as shield to absolve themselves of faults.
For example, a few of my friends and their acquaintances are Bronies and one of them knew I didn't care too much for the topic. This guy is probably one of the smuggest dickwads I've ever met. Whenever I was around and talking to my friends, he'd always come over and change the topic to ponies just to piss me off. When I finally called him out on it, he says that I can't be upset at him and that I should learn to "love and tolerate" what other people like. Cue smug laughter.
Or my favorite is when Bronies invade a thread with pony pics and when anyone points that out, they always claim that it's because "non-bronies" can't "love and tolerate" like they do. This doesn't happen as often anymore, at least.
I don't hate Bronies, they're entitled to their tastes. But there's something about the fanbase that reminds me of everything I hate about fandoms.
Also Invader Zim is the bomb.