For example, in a public seat, someone sits down first, and then just gets up to go to the bathroom,

I don't think it matters by any means, because it's not a big deal!

In my opinion, I don't think there's a reason for the person to sit down first to give up his seat, because there was no one here when they came, and they can have a reason to sit down! Taking a step back, let's take a step back and see what evidence the man had sat on before. I'm just analyzing it objectively, don't blame me for being wrong!

No. Who told the man to go first. The seats are empty. Whoever sits is whom, and there is no reason to let it. The man thought he was unlucky.

This shouldn't be, because this is a public place, and the seats belong to everyone, not him.

Public, everyone shares, whoever sits is considered who's, and it's something he is willing to let him do.

If you leave with your luggage, you can't take a seat anymore when you come back, and your luggage can be greeted and given way.

Public places, not private ones

Since it's a public place, the seats aren't personal, so it's impossible to reserve them for anyone, but if it's an old man, I think even if you don't leave, you'll get up when you see it.

It depends on the situation, if it is an old person, it is necessary to respect the old and love the young.

No, this is public.