I've never seen a solid reason in writing for why BPDs tend to over-focus so much on Christmas and it becomes an absolute freaking nightmare; and while we all agree it's an issue, it does seem like there's variance. Some can't handle the stress of prepping, others can't stand the loneliness of not being invited enough places, others can't stand the thought of having to "compete for your love" with everyone else also sending you gifts, etc. Maybe some of it is just "normal Christmas crazy" and not even BPD-specific but as caretakers we just assume it's related to their mental illness.
I think many people struggle this time of year, but mental illness makes it worse, for sure. I'm active in the local ministries to the addicted and abused, and those scenarios also bring in problems unless they are out and have put in quite a lot of work to rebuild. If they are dealing with relatives and such, relapse is a potential risk.
When we were together with my ex, there was always some sort of problem. It was really hard not to anticipate an issue over gifts, parties he didn't attend, food, etc. The expectations were so unrealistic that we were doomed to fail.
I was sad this year as I always have been during the holidays since separation/divorce, but no drama. We had very few social events (of course) but mostly just enjoyed the season. We didn't hear from my ex at all.
My attorney was out (I'm still in closeout) and was very careful to make sure that I knew what to do if a legal issues came up because it's very common for divorce issues to flare over the holidays. Thus far, no.