>>298525/a/ - on topic, friendly and they enjoy their hobby
/m/ - on topic, friendly and with a sense of sarcastic humor regarding the unpopularity of their interests
/jp/ - on topic, friendly and laid back; also 2hu4u
/s4s/ - clownish and fun, a board that doesn't seem to have an autistic raging hate on for anything
/pol/ - /b/3.0 after /b/1.0 eventually turned into a den of 3dpd thanks to /b/-day and /b/2.0 aka /r9k/ degenerated into a self-loathing hatebox
There are other decent boards on 4chan that I don't frequent, but "IRL-focused" boards like /b/, /v/, /r9k/, /soc/, /adv/, /lgbt/, /adv/ and /cgl/ tend to draw in antagonistic trolls, SJWs and underage b&s who venture onto other boards for the sole purpose of disruptive shitposting. They don't do it for irony or comedy, though. It's pure mean-spirited, triggered-by-things-they-don't-like normalfag cancer to the max.
Sometimes it's easy to forget that we used to have fun here.