I get asked or someone just tries to grab my seat a lot because I'm small, female, and un-intimidating. The answer is still "no." I'm just sick of it.

It's different if we're all in first, and we're all in the wrong seats because of the way the upgrades came in. Then I'll swap to put husband with wife and me with friend. However, I don't get involved in swaps in coach. There is nothing to gain. I have my aisle seat already, and I'm keeping it. Seat poachers get reported to the flight attendant. I no longer discuss it with them.

At some point, small people get sick of being pushed around. And I am definitely THERE.