I'm going to refuse to put my seat upright during my overnight flight
Is there a reason you will not put your seat up?
I love to be able to stay in a lying down position
It's mean to not follow flight attendant orders. You might disturb the passengers around you as well.
If you can't handle flying with me, change seats.
That is not the right attitude. If you wish to flu, then you have to follow the rules. Expect consequences if you refuse to listen to the flight attendants.