Here's a list of shibboleths that if I hear someone unjokingly use, they will get shot (non-exhaustive, may add more with your comments)

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