I had a customer get pissed at me, from a big company... I went on a service call... repaired the stuff... the guy called me sir... I told him I'm not a sir I'm a Jimmy... The next day he called and ask me not to send that Tech. again.. I told him, ok I won't send out again.. I did not tell him it was me and I was the owner of the fucking company... Didn't want to piss him off right then as I had a large bid in on a bunch of new Scale's... I got the sale and did the installation's... Never saw him again...
For years after I got out of the Army I called all men Sir..