If I was to say "Musk is an asshole just look at what he did at the presidential inauguration in 2025" and you said "you'd make a better point by giving a source for that ominous reference", I would think you were acting in bad faith because of how widely reported Musk's nazi salutes were at the time, and I would feel completely fair in saying "go and find out for yourself, you have all of the necessary information to do so."
I would actually think that you were in a position to defend that person but weren't ready to express that yet. So here we are with Thiel and Karp where 5 minutes of using Google or something would bring up various reports of Karp's recent conference statements. And I could have done that myself originally but "source?" is quite an irksome reply to deal with.