At the end of the day, if you know the restaurant is so busy and table seating is a huge problem…
… why not make plans with a backup restaurant in mind if you’re meeting up with friends, just in case it’s full already like it often is?
What if every other table was already occupied by people meeting friends. They’re all entitled to be there. This lady only bullied OP and told him to hurry up because he was there alone. And what you’re saying is that if you’re alone, you’re not really entitled to use shared resources beyond the absolute minimum necessary?
You’re calling for mutual understanding while supporting the position of someone who demonstrably has none as she goes around ordering people to leave public spaces becauss they think they’re more important. ‘Mutual understanding’ is revoked when it’s clear the other party only wants to abuse it.