"y-you're being divisive!"

nope, it's you who's being divisive by being offended and trying to on other hand divide us southern euros from MENA etc., claiming our kinship is with you only but not them

that said, taking jabs about one's heritage and the difference is not divisive at all; realising and acknowledging differences in a jocund manner is an easy way of easing tension and breaking some walls

the classic stereotype about ladbros demeaning each other jokingly and women acting sweet but talking behind back comes to mind here too

don't be that bitch

žižek puts this perfectly in his talks on how racist jokes work often: and in particular likes to mention how jokes about stereotypes in yugoslavia, which used to be so common during brotherhood and unity days, were suddenly no longer funny once shit went down