Ok I'll bite. Fully reclining my seat shouldn't be something that's looked down on. The person slamming their knees into the back of my seat preventing me from fully reclining should be more looked down on. The reason is that reclining doesn't intrinsically interfere with anyone else, but pushing your knees into someone else's seat absolutely does.
All passengers have the same and equal freedom to recline their seat if they choose, except for the people in the emergency exit rows of course. It's part of what you're paying for when you buy the ticket. If that interferes with the knees of the person behind me that's not my problem. The designers of the seats should ensure that fully reclining the seat doesn't reduce knee room for the person behind me. The airline constructed this scenario all by themselves and if there's a problem with it they should solve it themselves. I shouldn't be asked to sacrifice my comfort on a flight I paid for (just like everyone else did) because they failed to do that.
If we're really insistent that this is somehow not 100% the airline's problem, I'd next argue that if you don't have enough knee room in a regular seat with the person in front of you fully reclined, then you're literally too big for that seat. You should buy a "comfort plus" ticket. The airline should force you to do so.
People of all sizes are entitled to use the facilities they paid for equally. The airline should provide a solution for you, not the other passengers. You should patronize airlines that fulfill your needs and not patronize the ones that don't. I actually like the ultra low cost carriers that have solved this by simply not allowing the seats to be reclined.