The sarcasm can pretty well be explained as just a way to vent.
As the great Jimmy Buffett once said "if we couldn't laugh we would all go insane"
As far as the shortness, and occasional generally bad attitude I only need to quote the show
"Why is everyone we meet a big aggressive a-hole?" - Pegs
"Because all the passive ones are dead. " - Michael
"I've got tons of great ideas. Trouble is, most of 'em suck." George Carlin
"I've got the guns, the radio and the water for the Zombie Apocalypse, but you gotta have a yo-yo." Chris Boden
Hey, get a load of this. Guess who started writing again and has a spot in the fan fiction subforum?
Besides the situation being high stress selecting for Alpha type people surviving mostly I think some of it comes down to the requirments of the format.
If you're trying to tell a story in 20 minutes all the character interaction have to be written very briefly. This telegraphic style can make arguments sound a bit more blunt than they might otherwise. There isn't room for the beating around the bush and softening harsh words real people do when arguing with friends.
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