I've been fascinated by just how passionately enraged the people who do have a problem with this seem to be whenever it comes up on here. I've stopped doing it out of deference to them (it literally never occurred to me that it could possibly bother anybody), but there are people who seem to go into monitor-smashing rages when it happens.
I hope they add value instead of just saying hello when they see people irl. Because turning don't say hi into a crusade is sure wasting more of my time than just accepting an awkward hi from time to time. I passionately hate the syntactical police! I thought tolerance of peoples' differences was supposed to be all the rage these days.