At first a handful
‘CCP’ - 
‘illegal alien’ or some variation of it -
‘Death to Arabs’ (edit: it’s not a shibboleth but Israelis can really go fuck themselves) -
‘suicidal empathy’ (popularized by the likes of Gad Saad) -
'purity tests - oh yeah? here’s a pell grant tests a la Kamala
will add more if I feel like it
These are all over the place and I know I’m missing some, but what the hell, here goes.
“Goat herders” feels similar
I’ve mostly seen this one in the context of RPGs. Like as a synecdoche for a waste of ability/skill points.
It’s used as a pejorative for college majors like philosophy or English.