I think it depends what they do once in drag.
I saw a drag queen recently who not only impersonated a woman, but a black woman (he was white)...a combination that would normally have me at the barricades. But he used it as the most fabuloudsn base for sophisticated satire about SA, and was really not offensive to real women at all.
I think there are many drag acts which are misogynistic, but the form per se can be more like pantomime and a base for comedy whcih is not rooted in taking the piss out of real women. Good drag queens elicit comedy against their character, which is very much nothing to do with actual female women - they are saying 'look at ME, how ridiculous I am' - and that includes the fact that they are male.