I treated myself, Dad and sister to tickets to see an amazing blues/gospel guitarist and songwriter at an intimate acoustic gig in a small-ish venue.
Tickets and car parking came to £102.50
All through the show, sitting in the seat directly behind me was a VERY loud, very ignorant person who whooped and yelled and called out THROUGHOUT the show.
Let me just remind you: an intimate, ACOUSTIC one-man show. Costing over £100.
I have no problem with people showing appreciation at the beginning/end of songs, but this woman shouted out throughout the songs, kept shouting that she'd "seen him in London last night YEAH! WOO!"
One of the songs he did was Donovan's "halleluiah", which she sang along to. VERY LOUDLY. And very BADLY! Right. In. My. Ear. 
She whooped and screamed throughout the show, and my blood began to boil that I could not hear the artist over this loudmouth behind me! Over £100 on tickets and I could hardly hear! I couldn't figure out why no-one was saying anything to her, as she really was VERY annoying.
The artist began a well-known, well-loved song, and people began to clap along. She was clapping too. Out of time! SO out of time that the artist stopped playing and laughed "wow, you got your own rhythm going on there" she just laughed and whooped some more, totally oblivious as to it being her he was addressing, saying she was putting him off.
So, WIBU to explain to her that she was putting him off? And speak to her again later when she started head banging (acoustic gig, remember?) and flicking me with her hair?