Why do people complain about bug divers ?

I often see the stone get thrown to bug divers for not going to MOs but I also see bug divers being harassed and team killed by so-called bot divers who tell them to go to the bot front...

Why are buf divers more often targeted as "the reason we dont win" ? I mean, they have like all the beginners and low levels and the starting weapons cant really penetrate automatons on the front...

And why are squid divers never mentionned ???