to me, it looks like most of the people that have replied in this tread is acting similar to the guy in the pink shirt
How to Practice Airplane Etiquette: 7 Steps (with Pictures)
Quote: Check behind you—is that person tall, or do they have a child on their lap? If so, consider keeping your seat upright out of consideration, especially if it's a short flight. By reclining, you're taking space away from the passenger behind you; you may be more comfortable, but at someone else's expense