Is AUTHOR wrong in the post ? POST : So, some friends and I have gone on holiday to celebrate a friend's significant birthday. 

I live away these days so I haven't really been around for the organisation/discussions about the holiday or celebrations and so I didn't realise that as midnight hit on the eve of the birthday, the others appeared with presents for said birthday friend, but I didn't. 

I apologised and said "I'm sorry I didn't realise we were doing presents" which got a response from of "We'll obviously! It's their birthday!" from the s/o with nobody disagreeing.

This is the first one of these we've done together, they're the first one to reach a significant milestone since we've become friends, and as I said above, I wasn't around for any planning since I now live away.

Now, none of us are particularly well off, all quite young, either not long out of uni, and/or not in a reasonably paid job, and so I assumed each of us spending upwards of £200 on the holiday was enough of a gift.

I'm genuinely curious, AITA here for not buying a present? Was it rude of them to respond in such a way? Or even, am I looking too much into the comment?