I don't know anything about Richard Kind in real life, whether he's chill or an asshole, or whatever.
But in the TV show Stargate Atlantis, he plays a man named Lucius Lavin (pronounced lovin') who is by far and away the most annoying antagonist to grace the show. He appears in two episodes, named similarly as he basically does the same thing in a different way. Great small time "villain" who has sinister potential, but is just starting out.
Absolutely made me hate the actor, and I refused to watch some things because he was in them.
Incidentally, he surprised me in a few shows as side characters, also annoying.
No idea what he's like for real though, so maybe he is annoying and unlikeable.
Kind is so good at playing that special kind of annoying turd who never crosses the line quite far enough to justify the violence you desperately want to inflict on them.