The right way to counter his speech, in my view, is with speech, not threats to his livelihood.
There’s been a huge amount of phony posturing by some people – Tim Robbins, Susan Sarandon, the Dixie Chicks, et al. – about how their free speech has been trampled by robust criticism and even boycotts. That’s hooey. The government hasn’t touched them; and, of course, shouldn’t. But it’s perfectly legit for other citizens to speak out, boycott, blog, and so on.