Commercial Fixed Wing
Maintenance Powerplant; Maintenance Airframe
Maintenance Inspector 0; Maintenance Lead Technician .5; Maintenance Repairman 0; Maintenance Technician 4
Confusion; Communication Breakdown
Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors; Environment - Non Weather Related; Company Policy
I arrived at the gate for the meet and greet. I see the FO outside during his walk around and ask him if the airplane is fine as far as maintenance goes. He replied to me everything is fine and handed me a box of light bulbs he found underneath the aircraft. We walked together towards the aircraft. I entered the aircraft with my face mask on and entered the flight deck. The pilot then began shouting get out! I walked out; I asked the Flight Attendant is everything okay is he always like that? So I went back to the flight deck to retrieve the logbook without disturbing the pilot I was met with more yelling and shouting. I walked off to the back of the airplane with the logbook and checked if everything was okay and went to return the logbook where he began shouting get off of my airplane. I responded to him and said during maintenance it is the Mechanic's aircraft. I then walked off the airplane to call Maintenance Control to inform them of the disgruntled pilot. He followed me yelling; then went and locked himself in the cockpit. I told the Maintenance Controller 'You know if I look hard enough I can find a reason to ground the aircraft; but I'm not going to do that' He responded 'Yea; I agree we don't want to do that. Let me call Dispatch and Operations to see what's going on with the pilot.' The pilot then comes out of the airplane yelling and gets closer to me aggressively I responded in a professional manner and told: 'I could ground the aircraft but I'm not going to do that.' He then started yelling 'Then do it a big shot I'm going to get you fired.'Maintenance Controller called me back and said 'The pilot had already been very upset because 3 passengers didn't want to wear masks because of medical reasons and that put him in a very bad mood and he let it out on you.'
Technician reported a Captain was confrontational when he entered the flight deck.  Reportedly; the Captain had dealt with passengers not wanting to wear their COVID-19 masks.