I've name changed here because this might be identifying.
Today I didn't go to a surprise event. I sent a message to the organiser first thing and also to another attendee. The reasons I felt I couldn't go were that EBF DS was unwell so I couldn't take him, I spent yesterday stuck in traffic for a considerable time resulting in aggravating pregnancy complications that are very painful and could worsen if I'm not careful, also there was the real possibility of being stuck in traffic again today. This is ontop of other health problems that have worsened this weekend.
I planned to speak to the person who the event was for once it was over and offer my apologies (obviously couldn't do this before the surprise). I've received a passive aggressive message questioning why I "couldn't be bothered" to attend. They did have a simplified version of my reasons. I have explained the issues with the travelling and the other health problems. I've been told that these are not good enough reasons and questioning my character. So was IBU to not go? Also aibu to be upset by this person's reaction? There are some childhood abuse issues that have been triggered in the last week so i don't know if I'm being overly sensitive.