I do believe progressives should have the guts to argue back when they disagree, and argue strongly against what is contrary to progressive values.

I don't believe that we should be demanding renouncements.  I think it's gotten out of hand and frankly I don't even know what it is for.. I think it is one thing to renounce an endorsement which seems to be a more formal connection and thus can be formally rejected.  But I vehemently disagree with the notion of renouncing a person.. that goes too close (and maybe crosses a line) toward dehumanizing them which I believe is always wrong.