Plenty of cussing to go around, but no phrases I can recall.
People he didn't like were assigned a nickname, such as dodo, dum-dum, dipshit, etc. "Ole dum-dum was out there today, still working on that same engine."
His catch-all term for any collection of mouth breathing masses was simply "idiots."
"Watch out for idiots." ; "If you wait until noon, there'll be a lot more idiots there." ; "That extra size (motorcycle engine) is good when you've got two people on, and want to get away from an idiot."