Good guys are the scum of the Earth.
Not being a good guy is something to be proud of.

It really depends upon what someone considered a good guy. It is a rather subjective term, as is bad guy. I don't consider someone looking out for their own self interest as good or bad. That is life. Everyone does it to a certain degree or they would long ago have been dead. Ayn Rand covered this pretty well in her books and many people get hung up on the concept of "selfish" without really seeing the underlying message. That's a problem when we judge words by our own subjective biases/preconceptions.

I'd argue that "good guys" can be scum, and "bad guys" can be good. :) It's totally subjective and to not qualify is to turn it into a generalization, an implied absolute, which are both generally false.

I do get where you are going though and for the most part I agree with you, I just think it is worth qualifying so as not to rope yourself into that generalization/absolute logical fallacy zone.