Speaking as an older person who's been on the internet since it became a public thing, I don't think it's necessarily older folks' fault. Most of the crappy interactions I had on there were with young "edgelord" male gamers.
I think it's more nuanced than any one group.
Basically, if you build it they will come refers to the dross, who come in droves once something is a recognizeable "thing" and then we all have to abandon ship for greener pastures and more measured discourse.
It's not appropriate to ask a woman out when she's working. Service staff get hit on all day and they're just trying to work.
You can slip her your number if she shows up at your place of business and leave the ball in her court though. If she doesn't contact you then there's your answer.