An atrociously undesirable source of praise

In the highly unlikely event that I were to receive praise from white supremacists, I would say "Whoa!", take a step back and then wonder what terrible thing I had said to attract acclaim from such an awful source. What I wouldn't do is ignore it or make any sort of overtures to them; this is not a group with which I want any sort of association. In fact, taking a step back, re-evaluating yourself and then rejecting such praise should be the default position for any reasonable person. Anything other reaction will be viewed by the giver as an endorsement or a promotion of their ideology. That's how they think.