I lived through the 1970s and the airwaves were full of Carly Simon, Linda Ronstadt, Stevie Nicks, Olivia Newton-John, Donna Summer and at least several hundred other major female performers.
Take all the hits from the 1970s and put them on shuffle and you may well hear an hour or two of just male voices (or maybe all female voices). Means nothing. And even if the restaurant was purposely avoiding songs sung by women, so what?
Women like this are not doing their gender any favors at all by sending out tweets like this. Once a woman wraps herself in a mantle of victimhood, she is confirming for all to see her insecurity and her inferiority. A victim is looking for rescue. Maybe she is waiting for a man in shining armor to storm into the restaurant on his war-horse and force the owner to put on a Helen Reddy record.
This means one of four things:
1. It was a statistical fluke. Move on.
2. To combat this apparent misogyny, Betsy should open her own streaming service.
3. The service actually DID play a tune with female voice and Betsy missed it.
4. Betsy's friends at the restaurant should be incensed that she's more focused on the music than their physical company.
She's so vain, she thinks we think her stupid song is about us.