My current girlfriend and I are super open about pooping actually! I was able to tell her all about my struggles and she was more than understanding. I'm able to go when I'm with her and be pretty comfortable.
I agree, the holidays are still difficult for me as well. I live at home and even when we have other family members stay, I start getting constipated because of the pressure, judgement, etc. that I feel if I have to excuse myself to go to the bathroom because I know I'll be in there for up to 15 mins at times and don't enjoy the comments, like "what took you so long?" Which has happened plenty of times over the years. But I have to learn that it doesn't matter. They don't care if I'm pooping.
Sorry for the long reply, just wanted to share a bit about my personal experience and let you know that I relate