I had the misfortune to fly EgyptAir a few years back and after connecting through Cairo for my flight to Hurghada suddenly realised that my seat was something like 20, queue a little panic and DYKWIA to the gate agent who kept trying to tell me that I was in the correct seat, i assumed something had been lost in translation , but boy did I feel an idiot when boarding and realised I was in J and was seated at the front due to a strange numbering process . Never flown with an airline since who number in such a strange way.
Flown business and first alone from my late teens, and through my twenties and often dressed very casual, perhaps even very scruffy on occasions , never once had an issue from other pax or airline staff. As for pushing in , life for me is too short to get stressed, I just go with the flow. Learnt how to relax and avoid confrontation whilst in the Middle East and Far East.