common,
maybe I misunderstood you. You said – you were fully complaint (using your common saychel) and nobody bothered you. So, that seems liker a proof that they would not bother complaint people. Others were not and they were told so. I don’t see why you would not support this. “Partially complaint” is a subset of “non-complaint”. What makes you feel that rules are suggestions, and people expect to comply after a couple of reminders? Note that you are making an occasional trip, the airline personnel is in the air a lot at the mercy of non-compliant passengers. Their risk is pretty high. You should be telling other passengers to comply in order to protect the people who enable you flying.
A statistical aside for your decision-making: having a non-compliant person is a higher risk than simply a difference between him having a mask on or off. Presumably, the person is non-compliant in other places also, so he is a much higher risk. He might have just came from a 1000-people wedding in corona-central. So, if you have a minyan and a guy like that shows up, lowering his nose under the mask does not lower the risk. Maybe chachamim used a similar approach defining Haverim in regards to Tumah? Haver is someone who is careful at all times not only when you interact with him, and thus you can rely on him.