You are not being unreasonable at all. I think the cheek of it that your adult son can treat you like this, can’t see you until before February.
I’ve had a similar thing with my youngest adult son - 28. He lives about 6-8 miles from me, has a busy lifestyle, works in hospitality so it’s a precarious situ at mo with omicron and no restrictions! His recently new girlfriend who is lovely. Anyhow I met up with him early December, Xmas was one of the things we discussed. His Xmas day was with his g/f families so all mixing about 8-10 of them. I offered the two of them to come to us Boxing Day, (this is better than not at all), his response was shall we just wipe out Xmas?? Thinking he meant presents, I responded by well no it’s xmas. I also mentioned that as any variant of covid takes off when infections rate rockets sky high I started getting anxious about mixing. I stated that if things got worse leading up to Christmas I might cancel out Boxing Day, really because of his mixing with so many people Xmas day & he also was going planning of going out pubbing Xmas eve. He took the cancellation of Boxing Day well, something if I look back he may have felt relieved about, then to be told that Boxing Day he was going to spend with his g/f dad and family. My irritation is that now I think he only wanted to ‘wipe out Christmas ‘ with me and hubby because he was finding it hard to fit us in?? I may be wrong, I realise he was prepared to see us Boxing Day but I cancelled. So I shouldn’t be feeling the way I do. I do feel hurt by it. I haven’t heard from him since Christmas Day wishing us a happy Christmas. We were invited to his works for NYE, but being pub/bar/restaurant it would be so busy we declined this offer, but all his g/f families will be going. I feel hard done by and left out of my son’s life for her family. It hurts, it sucks!!