Sounds like the person was an asshole. But there are many, that's why businesses use "Happy Holidays" to avoid them.

Though most people don't care enough. It is really which kind of person do you deal with. I actually had a situation when my neighbor who is Jewish without much thinking wished Merry Christmas and got same response. Just few seconds later realized I made a mistake and corrected myself.

I suppose if somebody is an Orthodox Jew and dresses in a way that screams left and right who they are, those kind of people might take it that you say Merry Christmas to purposefully offend them, as they put so much effort to show who they are.

May they rest in piss

I like to imagine that there's a White Hell, which is Black Heaven, but that Black Heaven is just Heaven and the viewers from White Hell only notice that some non-white people are having a good time.

Yeah the worst part is dump emboldened the worst people on earth. Like you said, hopefully they'll be dead soon.

Or just to rub in his face he's dead and can't eat any, effectively celebrating his death, sarcastically.

It is Europe, those types of laws usually apply, if you are doing it in public, or as hatespeech etc. I would imagine the grannies can bake all the Hitler-cakes they want, inside their own homes. The dystopia taking over, is supporting making those cakes anyway