All these years, I've always considered the word yahoo to denote masculine gender. Not any more. It's not that I have any objection to women singing in public places. Indeed, I have seen and heard many, including some who are friends, do so in bars or at parties. It's also not that I feel only men are allowed to sing drunkenly in public.
Women certainly have the same right to make fools of themselves.
It's not as if our tormentors were singing Happy Birthday. That kind of singing doesn't even raise an eyebrow in Montreal. Often, other diners join in and clap. But then it's over. Conversations resume, wine glasses clink, business deals are struck or assignations planned.