Actually, I'm pretty tall. It is at the least awkward, if not very uncomfortable for someone to recline. It depends on the plane, but those interstate mosquitoes you get on flights between small cities are the absolute worst.

I know it's en vogue to treat everything as an economic exercise to show off that business course you took for your undergrad, but some things are really a matter of being a decent person. I've asked people to please not recline when it's a problem. Usually people are cool with it on the short flights where it really is a problem. Of course you sometimes get an indignant person who needs their 30 minutes of "relaxation" and that's when I push them up. If they prioritize their comfort over mine, why shouldn't I do the same.