It's all in the interpretation I suppose. By eliminating what he does NOT want in his band, he is certainly laying the groundwork for what he DOES want in his band, and it would warrant a further conversation to get to that. A CL ad is never a complete picture IME. I give him tons of credit for speaking his mind and being honest. He is trying to avoid certain types of musicians, and the descriptors ring true with me. We've all seen them, and he doesn't want them in his band. I also don't believe insulting people is his primary intention; that's a residual, the collateral damage of the thin-skinned people who fit the profile of what he's trying to avoid.
If you`re going to post an ad, post an ad, not a rant. It`s just as likely he`s turning off qualified people.