Just because you can do something, doesn't mean you aren't being rude. I'm 6'4" and can generally handle it no problem,
but sometime my knees will end up digging into your back. If it isn't my knees, then you reclining puts my tray out of use.
I don't recline if there is a tall person behind me, and the only time I get mad about it is if the person in front of my flies back with reckless abandon as soon as the bell dings and sends my ipad flying.
Sometimes it makes it uncomfortable and bugs me, but i've had people ask if I don't mind and if they do that i'm not bugged at all.