Well, I didn't have a bad thing to say about him, but I did have a run-in with someone else who was saying Robin Williams was often imitated but never equalled ... that he was a unique comic genius who, virtually, owed nothing to the comics before him.
Of course, timing around someone's tragic death is poor. But I hate lies like that where people want to bring on the reality distortion field. So I pointed him to Peter Sellers' performance in Kubrick's "Lolita" as a shockingly similar copy of the manic act that Robin Williams made famous as a comic two decades later.
If you haven't seen it, it's definitely an amazing performance and worth a watch. I'm sure Mr. Williams would approve in his honor.