AITA, me and my ex have an 8yo together and have 50/50 custody,

we separated right before Christmas last year, well this year for Christmas I was able to get kiddo some big ticket items by working my ass off and saving any extra money. I had. I am aware that money is a lot more tight at the other parents house. Well I got a text message saying I should have consulted with them first because kiddo was not as happy with the presents at my ex’s house, and that I should not be teaching them that Christmas is about the cost of the presents. I just wanted them to have a magical Christmas, I have a lot of expensive health problems that came up recently and I know going forward Christmas isnt going to be able to be as elaborate as this year, and I explained that to kiddo. However, AITA for spoiling the hell out of kiddo for ONE Christmas and not consulting the other parent?
Edit: I think I need to address one thing for everyone. My kiddo is on the spectrum and has a lot of social-emotional delays. They have been receiving social skills classes for about 4 years now and has come a long way but still has trouble expressing emotions correctly