I speak from experience, don't respond or attempt to rile up you-know-who if and when he does show up.
It might seem as though it's a good idea to bite back, but that only serves to escalate the situation rather than calm it down. The best course of action is to report you-know-who's comment and let it be dealt with behind the scenes.
(On-topic, I respect the Sonic VS Mega Man support).