I'm convinced this guy has irl issues.
I can guarantee it 100% from decades of personal experience of having severe issues myself and dealing with a LOT of VERY difficult people including my neighbour right now as usual.
I can see such typical patterns, red flags from them them that I as well as others have exhibited before many times.
I don't want to get in trouble for saying too much but when multiple people are describing someone in the sane manner and making the same complaints, it's not a coincidence ofc.
In other words I'm sick of this tantrum behaviour and this is coming from a person who throws tantrums ironically too, it's just immaturity ofc lol.
Normally when people are like this, theres a trauma at least behind it. Whatever it or they might be. Or just having their ego fed too much especially for too long.