Two weeks ago, I saw the loner at the table of an event. Went to go talk to them because they were alone for a while.
In less than 10 minutes, they made a offensive joke that would have insulted half the people here, and complained about their living situation unprompted.
You know something that often gets overlooked about bigoted "humor", is how predicable and tiring it it. Even if it wasn't inherently offensive, it's not funny.