I don't really use this word or feel the need to participate in discussions about people it represent, but for me, when I see it somewhere, "brogrammer" means an equivalent of "cool people" from high school. Existence of them became possible due to programming becoming lucrative, with plenty of easy learning material, and therefore, beneficial for people you wouldn't at all consider a nerd to learn. It's a programmer who comes from outside of nerd culture, who looks at it like a cool kid from high school looks at school nerds.

It has also a bit "hipsterish" connotation - brogrammer is someone who's "not really into it". "The true nerds" were programmers before it was cool.

At least that's how I understand this term. "disliked man in the tech world" is much too broad, as so called "brogrammers" are supposed to dislike "true nerds".