In my experience it's been about a half-and-half split between managers I respect and those that I don't. It's certainly not my preference but I have worked for people who don't really respect me and, very likely, didn't believe I deserved all sorts of things (a living wage being among them).

That said, Mozilla works in a competitive environment. Perhaps it would have made more sense to wait for valuable employees to start leaving before dismissing their CEO. While I find his position on Prop 8 offensive, as others have pointed out, they are entitled to their beliefs.