Also, almost every single post has been flippant and dismissive, and not in a faust way. There are usually two reasons for that type of play: pressure or character.
I don't know uncle, although we've played before. I do know the community, and we have all sometimes lost our way, but we generally find a way back, usually through reflection, a time away, or meaningful apologies and conversation. So I'm ruling out character here.
That leaves pressure. Players respond in different ways to pressure when non-town. That's one of the big ways we try to catch them. That's how I zeroed in on joth. Uncle using insults and sarcasm really reads as a player who is deflecting his own feelings of nervousness and fear to others.
Have you ever had that friend or acquaintance that, when they say something incorrect and it is pointed out to them, they just get mean and nasty instead of thankful or humble? It's like that, only it's caught mafia instead of a wrong answer to a random trivia question or something.
To bring back my example I used with joth:
Uncle: Hey, did you know that McDonald's was founded in 1954?
Me: Actually, I think it was 1955, but yeah, that's so cool that it's been around so long.
Uncle: No dude, it was 1954. I know what I'm talking about. Who would have thought fast food would make such an impact on society over so many years?
Me: Hmmm...[googles]...yeah, looks like 1955. April 15 to be exact. Close though. Definitely, at the time, I'm sure fast food meant...
Uncle: Screw you man. What kind of friend are you? I can't believe I'm even talking to you. Even your hair looks stupid. F this. I'm out.