I've heard men in the tech space who I would normally have considered very nice people say extremely sexist / homophobic / transphobic things. When I've called them out on it, they've been surprised that anyone was offended. As I've said, otherwise really nice guys, but they seem to have just thought such comments were acceptable in the context of the 'community'. Strange stuff.
Have also seen casual sexism and racism used. I assume these people aren't racist or sexist to the point it would affect anything they do professionally, however it does detract from my view of them.
On the other hand I swear like a sailor, although I try to pull back from it in public - I occasionally slip. Especially when I'm dropping the C bomb (usually targeted at an inanimate object).
Is it unprofessional? Yes. Should I be judged? Fuck yes. Do I care?
I agree. That is not justification at all. I just think if you call people misogynist/homophobic/etc you shouldn't be hesitant to provide a concrete example of them acting that way.