Would you treat coworkers like that? In meatspace? If someone called me a fuckwad in a way that wasn't obviously jokey/ironic it would be a huge problem to me. Being nice and civil is a much better way to get things done. Like, grumpy/curmudgeonly is kinda par for the course but that's totally different.
I used to work with a really toxic dev that for whatever reason our management dept protected. He was extremely misogynistic and refused to work with any women. One time in a meeting he said something basically like "it's in the spec, you stupid bitch" (as an aside, it wasn't in the spec