Reminds me of a time when I was working as an Engineer at an Eastish European Outstation for a well known Independent British Company. We were all Engineers and Pilots trying our best to make things work. This effort involved a certain amount of socialising.
One evening, some engineers arrived at a party arranged by the locally employed cabin crew, armed with the pre requisite case of beer as an entrance fee. They were met at the door by a newly qualified wet behind the ears F/O who relieved them of their beer and told them 'politely' that they were not invited. As fine upstanding gentlemen, the Engineers left without fuss and went elsewhere.
Needless to say, the news of this event started to filter out over the next day or 2.
Fast forward 2 days and I am doing a turnround on one of the Aeroplanes, and the F/O is the very same newly qulaified wet behind the ears chappie. His Captain, was a young guy who had an Engineering background. So, we are all in the flight deck together, and the Captain says to the F/O, pointing at another Engineer doing a walkround next door, "See that Engineer down there? I want you to remember that one day you will need him more than you need the hole in your arse, so treat him and his friends with respect." Then, reaching into his Flight Bag and pulling out a burgundy document with gold embossed lettering that he places on the centre console the Capt says: "Furthermore, you need to know, that I AM ONE OF THEM TOO, so you give them the same respect you give me!"
The burgundy document was the Captain's UK CAA Aircraft Maint Engineers Licence (Sect L in them days). He had served an apprenticeship with a UK Airline and done a number of years on the connie circuit before becoming a pilot.
No further problems were experienced