Hi and welcome to Wrong Planet.
I personally don't think your reaction was due to Asperger's. I'm not saying it isn't possible, but really, you'd have to lock yourself in a closet throughout the Christmas season to avoid much of the bad taste people demonstrate with Christmas decorations.
It's hard to avoid. As long as the display wasn't noisy (bells, chimes, ho-ho-hos - it wouldn't bother me. A lot of work places won't allow lights and other types of decorations that could be a fire hazard.
I like tasteful decorations, non-commercial, not flashy. Poinsettias, Holly, evergeens & pine cones. At home I set up a nativity scene and lights. In the workplace, most workplaces, these days, religious connotations to Christmas are not allowed.
Christmas is okay as long as it stimulates the economy, but please, take Christ out of it, thank you. It is not politically correct to set up Christmas displays in public places. Some places allow Christmas trees because it's good for business.
We must deny that we have any religious beliefs you know, so as not to offend anyone who doesn't.
I really hate those big blow-up monstrosities that people set up on their front lawns.