A bit of back story about my crappy weekend which is kind of relevant to my AIBU...
DS (18 months) broke his elbow on Friday at soft play (he was standing on a little foam hump and fell off and landed his full body weight onto his arm 
). It's been a crap weekend of being in hospital, x-rays, and a baby in lots of pain. Today we were waiting to hear from the surgeon to see if DS would need surgery. We were told we'd be called at some point this afternoon.
We'd booked DD (6) on a Greatest Showman musical workshop for today. Dropped her off this morning and there'd be a 5 minute performance at 3pm. DH took the afternoon off work to see it.
We didn't know if we'd both make it because one of us needed to stay at home to hear from the surgeon (we live rurally and don't get mobile signal so our contact number is our landline). Luckily he rang at 2.30pm to say that he's confident DS doesn't need surgery and his elbow will heal without it (yay!). So, we technically had enough time to both make it - but half way there there was an accident and traffic backed up. It meant that, to make it for 3pm, I just got out the car down the road on my own and legged it into the venue. There just wasn't enough time for DH to park up, get DS out etc.
When I got to the room where the performance was happening, parents had to stand against the back wall. I spotted a gap big enough for me, next to a bloke who was about 6ft (I'm 5'6) so squeezed into it.
Just as the performance finished, and everyone was applauding I heard the bloke behind me shout "Thank you so much" but didn't hear the rest of it because of the noise. I assumed he was thanking the performers. Then when the clapping died down he shouted (repeated) "Thank you so much for standing in my way the whole time so I couldn't see a thing". I realised he was talking to me so turned round and said "excuse me?" And he repeated himself (again shouting). I snapped "you should have said something rather than waiting until it was over and shouting at me". He looked a bit taken aback, I expect it's because I look meek. I was standing slightly in front and to the side of him (so not shoulder to shoulder) I don't see how he couldn't have seen. If he'd said something, I'd have crouched down to watch it. He only had to ask.
I was mortified, I started a job 2 weeks ago and a colleague was nearby, and I'm sure everyone heard (my DD certainly did as she asked afterwards who the man was who shouted at me). I've come away pleased that I didn't just say "oh sorry" (once upon a time I would have) but also furious. Probably hasn't helped that my weekend has been crap with my poor little DS, or that I felt bad DH missed the performance, but i am now incandescent with rage - because he would not have said that to a man, would he? If my (well built) DH had gone in and not me, he'd have kept schtum. I get so sick of putting up with this bollocks because people think women can't/won't fight back.