and I consider it similarly rude to just walk up and tell someone “hurry up”.
why are you acting like the person at the table now is inherently inferior to the one that wants the table? OP is “hogging” the table as much as the girl would have when she sat with her friends. less, because she’s there to meet someone socially and not just eat and leave. she’ll be “hogging the table” for a lot longer. if someone new walks in right when her friend sits down with her and says “leave, this is my table now”, you believe the correct course of action would be to immediately end the friend meetup and vacate immediately, as commanded? what if the new person is just 1 person? what if the new person represents a party of 5?
if your goal, as it seems, is to minimized use of the shared resources to maximize throughput use and thus make it available for the most people, then you would not support the idea of meeting friends at a restaurant at all.
why is the person sitting alone using the table for its intended purpose of eating a meal from the restaurant inherently inferior to a person wanting to claim a space to sit at and socialize for a while? why are the latter so superior that it justifies such rude behavior towards the prior?