The last party you joined the guy was trying to get in your pants, these guys were already being A-holes so it's obvious they ain't gonna be any better
Watch them ultimately ditch shiina as monster bait while trying to convince chiba that he's dead or wandered off somewhere
I get that that Shiina is a doofus. But Chiba, haven't you noticed that Shiina is lying? You're supposed to be the smart one in your group. Make her talk honestly
Honestly, those rough guys look good and dangerous.
Although this might not seem the case of them being total assholes. In fact, being assholes in this (Chiba/Shiina) isekai universe is the matter of survival or necessity. This is not you being OP isekai-er, this is you with minimum stat and zero OP skill.