Here's the background story to this letter:
Dear lady who sat by me at the Bryan Adam's concert last night,
I think it was rude of you to ask my friends to "quiet down" so your "husband could enjoy" the performance. I don't know who you are thinking that it's okay to tell people to stop enjoying themselves, so you can enjoy yourself more. Have you ever been to a concert before? People talk. Sometimes they have fun! It was uncalled for, and I hope you mind your manners next time.
Oh, and hope you had fun after we left, but I'm sure you didn't because you were too busy being unhappy.