'non-obese' when talking about 'tech bro' / Musk is a stretch. He probably is medically obese (above 30 BMI). I know it isn't what USians call obese, but basically, for a man, once fat can be seen on your face, you're obese (I'm an ex-obese, I know).
To start with, which opinions? I may disagree with your (hypothetical) opinion that Go is the best language developed so far. I would not call you "bro" because of that, even if you were a non-obese male.
https://en.wikipedia.org/wiki/Brogrammer notes that '"Brogrammer" or "tech bro"' are "often used pejoratively to describe toxic masculinity and sexism in the technology industry".
This definition highlights how it's not merely 'opinions with which I disagree', but a specific set of opinions.
FWIW, The Atlantic is the publication which brought us the term "Bernie Bro", "to describe young, white, progressive men who, in his view, support unrealistic progressive policies and promote the Bernie Sanders campaign obnoxiously", including "sometimes attack in very sexist ways" - https://en.wikipedia.org/wiki/Bernie_Bro
The connection there is the toxic masculinity and sexism.