What right as a traveller would you have to bully someone out of his or her assigned seat, merely because you have a seat assignment you find to be disagreeable?

Remember, aircraft economy cabins are not made up of only window and aisle seats, someone has to sit in the middle from time to time. We may not like it, but that's just the way it is. If you don't like it, don't bully other passengers into moving, either accept it, don't fly, or pay for an upgrade.