I don't 'do' Christmas either. I've always hated it, even as a child. I had an abusive upbringing (both parents); my father would always go to the pub on Christmas day lunchtime, come home worse for wear and the atmosphere would turn bad.
The run up to Christmas was anxiety provoking, all of the pretence around a fake person, Santa Claus, went totally against my rigid need for truth (for context I am autistic), I hate surprises and I hate opening gifts in front of people.
My mother is incredibly manipulative and it took me until I was in my 40's to say I'm not doing Christmas any more.
For the past decade or so, Christmas day is spent in peace with DH. We have a nice dinner, go for a walk if we want to, watch TV in the comfort of our own home if we wish and there are no social pressures at all.
The commercialism of Christmas is so ugly. People getting heavily into debt to buy things that are half price 2 days after Christmas just seems like utter madness to me.
Opting out of it all was one of the best decisions I've ever made.
The only thing that pisses me off about it now is everyone moaning about how they have to do this, that and the other. They don't have to do anything. They choose to.