I'm not sure why you feel I don't respect someone simply because I don't want to work with them.

Had I thought of them, I would not have used any of the phrasing you suggest because they are insufficiently derogatory.

Consider this guy: The rejection of the other employee [by Julie Ann Horvath] led to...an internal battle at GitHub...hurt from my rejection, started passive-aggressively ripping out my code from projects we had worked on together...

"Act like an adult" doesn't have the same ring as "grow a pair" (although in this case, "stop being a whiny bitch" would be my preferred phrasing).