I'm having trouble thinking of insults and slurs for my lizardfolk to use against humans and I need some help. All I have so far is "mammal" "smooth skin" and "tail-less" but I need better ones. My lizardfolk are swamp dwellers, resistant to diseases and don't like humans. Don't know if this should be in Setting or Dialogue. I'll put here for now and let the mods decide.
I guess you would need to think of the differences between reptiles and humans. Difference is emphasized in putting others down. "You placental bleeders!" "You over-thinking brainiacs!" "You hairy bipedals!" "You city-dwelling apes!"
Thinskins Red-bloods Red-bleeders Dreadhairs Smooth Apes Clawless Hornless And last but not least, from a greek philosopher: "Featherless Bipedals"
"You have no true brothers and sisters, spawn of an eggless clutch of one!" See, lizard people don't consider children of the same mother to be siblings if they weren't from the same clutch, so unless you're a twin... and the whole icky disgusting action of childbirth, rather than a mother cleanly pushing out eggs. I actually kind of agree with the scales on that one "You call those claws?" "You cut yourself...again? What is that 'skin' good for anyway?" <to someone with a bad sunburn> "I didn't know humans could molt. Will your next skin have proper scales?" "But you just ate yesterday! Why are you always so hungry?" (cold-blooded systems are more energy-efficient, although that leaves them less able to be active in cold weather) "Fucking ice-walkers...that just creeps me out how they never slow down." and of course: "Your mother was a hamster and your father smelt of elderberries!"
Couldn't think of a better single-penis insult than above lol. Let's see... Stump-tongue Drooler Juice bag Fuzz-face/ fur-face Soft-sack Tail-tucker
Although species-specific insults are fun, don't underestimate the utility of standbys that cross species boundaries. Asshole, e.g.
What if these specific lizards secrete their excrement through pores all over their body? Then they can call the humans: Pooprears Shithole Bottomfeces Rearpoopers Onebutts Single-shitters Simple-dung
How did you enjoy gestating inside someone's gut, you balding monkey? You have external genitalia? So much for intelligent design. I bet you can't even lick your own eyeball, chump.
You might also look at the world War series by Harry Turttledove. His aliens where lizards. You could also direct insults to humans wearing clothes. Or them being nestles. Another angle would be humans not having a proper mating season.