soccer’s a big thing for them; but they sound like gamers based on what you’ve shared so ymmv:

make comments that suggest that their best players are bush league and that the portuguese, brazilians, and the british are the real pros; it matters that it’s these specific countries and be sure that real madrid is in there somewhere. don’t be obvious about it since it’s already hit dated meme territory by this point so they’re probably mostly over it by now.

if you want blood: go after the old king and his children except for the current king; that guy is made out of teflon since nothing seems to stick to him like reagan.

they’ve been embroiled in corruption controversies so severe that the old king is in self exile to avoid prison time and the spanish royalists try REALLY hard to pretend that he simply retired. it will be more effective if most of them are catalonian or basque; you can tell by their accents and by the way they spell. (ie sort of like color vs colour but because they’re different languages who have to use spanish instead of a british/american like relationship). it’ll get blood because the monarchy is divisive for the peoples the monarchy screwed over to get back into power and, very recently, to also maintain it; especially for the basque and the catalonians. warning: this might get you labeled as a spanish tankie since the monarchy (BARELY) enjoys majority support rn and the royalists are spain’s ruling class; or atleast the rich ones are anyways…