I frankly don’t give a damn what Muslims do for Christmas as long as they aren’t blowing up. They might well do what I do for Muslim holidays — nothing.
The issue is not what Muslims do, it’s that they are pressuring Christians (and foolish Christians are pressuring themselves) to do away with their own language, remembrances, and traditions. It is all insane and depraved.
If I go to another culture I do not expect them to drop any/all of their usual practices to not “offend” sensitive me. Generally I will enjoy learning and partaking with respect, as a friendly outsider, as the natives deem appropriate. In any case, I do not expect them to change any of their cultural/religious practices just bc I am around.
But Muslims invade and even as small minorities expect everyone to drop everything, bend over, grovel.... it gets worse and worse as Muslim numbers grow, of course, but even with relatively small numbers they start to demand all sorts of concessions, etc.