I dislike it when people say variations of "It's okay to be a brony but don't wear MLP:FIM shirts in public." I wear Super Mario Brothers shirts, Pokémon shirts, and shirts with toucans because I like those things. If I find a good MLP shirt, I won't hesitate to wear it. I wear shirts of things I like because I can meet other people who like these things.
HOWEVER, I dislike it when bronies do things like: forcing pizza restaurants to draw ponies on the box or otherwise pestering non-bronies. It's not because they're bronies and it's not because it's MLP; I would dislike ANYONE from ANY fandom who would do this kind of thing. So to answer the OP's question, those are the types of bronies I dislike (or at least, I dislike their actions.)
I think there's an important line between wearing a "20% cooler" shirt and downright harassing people.
Oh also, I don't listen to the "love and tolerate" line because it's brony invented, not from the show. I do my best not to hate anyone, but there are some things I just cannot tolerate. (Examples: I cannot love someone who tortures toucans. I cannot tolerate animal cruelty.)