Is AUTHOR wrong in the post ? POST : So, basically this all happened the last few days.

My company throws some really great party every year, and after being unable to attend a few times I was really excited this time, given that I am not the best at socializing with people at work so I was kind of hoping to get some good drinking with colleagues going on. I was really seeing this as a great opportunity to get into some groups and circles I am usually too shy to approach. My girlfriend knew that. And also, the parties are usually really big and lush, because my employer really wants us to have a great time. 

As it turned out, while I was being driven there, my girlfriend texted me that her grandpa was having a bad time, he seemed to be bedridden and not really able to talk too much. Of course I tried to comfort her and trying to calm her down. Maybe a bit of context here: She is usually the type of person who tends to overreact when it comes to medical conditions, and I on the other hand already lost both my grandparents a while ago, so I know the likes of which medical conditions tend to appear on old people.

Anyways, she tended to respond really rude in my opinion, just some quick one liners, not really providing me and information or proper conversation, even though I tried to cheer her up and consolidate her. I was having a great time at the party, and I kind of didn't want to let this drag me down, so at some point I also only responded with some quick answers.

As the night progressed, I was getting kind of drunk, but not in a super bad way, I was just having an amazing time with my colleagues. At some point she told me her grandpa was brought to the hospital and I once again tried to consolidate her, but it was noticeable that my messages were getting less readable given my state of drunkenness.

Fast forward to the morning after, she was super pissed and disappointed that I didnt take proper care of her and consolidated her. She did not really care about what I did or how my party went.

So, AITA for getting drunk and kind of leaving my girlfriend aside in order to have a great time with colleagues at my company party?