On airline flights, do you recline your seat or do you feel it's rude to do so because it severely limits the legroom of the person behind you?

I just saw something on the news about an altercation that occurred when a man used a plastic device called a “flight defender” which disallowed the passenger in front of him from reclining her seat. She ended up throwing a glass of water at him and the pilot ultimately had to land the plane and both passengers were removed.

The news program was discussing how when you recline your seat, you are severely limiting the legroom of the passenger behind you. In many cases, the seat in front of you will be right up against your knees. However, those few inches of recline make a big difference in passenger comfort for the flight.

Do you recline your seat on flights, or do you feel it’s rude to do so?