I have never worked in a ‘proper’ customer facing job (thank Christ, reading some of these), but I have faced crazy complaints from insane colleagues.
Colleague 1, at Big Four accountancy practice, complained that I “walked around the office too quickly, unnerving him” and “stood over him in a threatening way when I was at his desk”.
He was two inches shorter than me, had an inexplicably massive ego and thought that women should be quiet and submissive. He was two years ahead of me, so I should do as he wanted, apparently. Twat.
Another time we were going out to see a client, and he was cursing another driver for preventing him from going at 100 mph in the fast lane of the M62. I said, “why not just dodge round the inside, ha ha”, clearly joking, because who would suggest undertaking at high speed? Later that week I discovered that he’d made a formal complaint to HR, on the grounds that I had “encouraged him to behave in a dangerous and unprofessional way”.
Colleague 2, at a different employer: complained that I was “too cheerful” (said ‘good morning!’ when entering the office, which wasn’t on, apparently) and “overdressed for work, which is unprofessional and designed to make me feel inferior”.