I had a similar issue when I was doing more help desk work as a college student. I worked in a hospital and older women would always complain that I wasn't friendly enough. I had a miserable fucking life - I was grinding myself into dust in every aspect and was doing this work purely to get to the next stage of my career. I was never unfriendly, I just was on a mission to get the work done and get out. Instead, these older women who were complaining really wanted a free therapy session. They didn't do meaningful work - they weren't cardiologists or anything of that (anyone with a "real" job would be so much more focused on resolving the issue and getting back to work - and, more importantly, learning how to self resolve the issue so they never had to talk to us again). Merely some paper pushers. I'd see my colleagues get hung up for 30 minutes listing to some of these older women talk to them about their life and then they'd come back with a haggard face.

Ironically, I ended up getting reprimanded again for having unprofessional tone because I made my response emails "too friendly". I was glad to leave that job and never return to help desk type work again.