He looks so friendly in the photo.
I suspect it's one of those things where someone is really nice and normal in person but their online persona, being buffered by the ether from actual human interaction, is the opposite.
It's too bad because there is knowledge to be shared there, but not desirable if it has to come with the condescension and the vitriol it creates.
I try not to say anything online I wouldn't say to someone's face. Haven't always succeeded, but it is on my mind.