To be fair, they're not particularly misogynistic. Jews, Aryans, gays, blacks, animals, Dems, Republicans - any group with a label is treated like trash on 4chan
If OP said "Bitch, I blah blah blah" then it could be argued that it's a figure of speech and not directed towards the waitress... but OP said "Fucking bitch" with no comma, so it's clearly directed at her.