I once had a rude passenger traveling with her baby on board. As a matter of fact this encounter was recently.
When one of the crew went to her to brief her (the airlines I work for make it mandatory for crews to brief parents travelling with infant below 2 years old) on how to use infant seatbelt and what to do in an emergency, with a flick of wrist she dismissed her.
"no need to brief me. I know the drill", without so much as looking at the stewardess.
When it was time to take off, she didn't strap her son in using infant seatbelt we provided. When we insist, she dismissed us again saying her baby is allergic to metal (the only piece of metal on the seatbelt was only the buckle and it would be right on her son's belly covered with clothing). All the while my brain keep going "this woman is a piece of work".
When we roll out our cart for meal service, she snapped her fingers at crewmembers demanding she be served first. Now, this is understandable since we always serve kids, elders and mothers with infant first. But you don't have to do it by snapping your fingers at us. You could have just stop our cart and ask nicely.
When we roll out our food sales cart, she stopped us to buy some snacks but refuses to take off her headphones while talking to us. Her sitting at window seat means she's farther away from me and her words were not as clear as the passenger sitting on aisle seat talking to me. I look at her dumbfounded that after a few times of asking her what would she like to buy, she keep muttering under her breath all the while not really bothered to make eye contact with me or take off her headphones.
So I pass all kind of snacks that we had, one by one until she get frustrated. She keep saying "no not this one! I want xyzcbhsjdkwhateveritis!"
I passed another packet of snack knowing full well that wasn't what she wants. "no I want xcbsggeyetheotherone!"
I took out a packet of peanuts that she most definitely don't want. "no! That one, I need xctshdchstheonenexttoit!"
This went on for a few minutes, while the passengers sitting nearby watch in amusement. Not even once I mutter anything rude to her, just pretending I can't fully comprehend whatever she's saying.
If only she had taken off her headphones and talk to me like I'm a normal person instead like her slave, I probably won't play dumb. In the end she got so frustrated she just said "yeah ok give me whatever you have then!" handing me a rm100 note to pay for something that cost her only rm7.
I asked if she has smaller notes and again I was dismissed like my fellow crewmembers. So I went around the cabin asking everyone if they have smaller change for me to return her the balance. I went from row 5 to row 30. Everyone just keep shaking their head saying nope sorry don't have small change.
Again, she got frustrated waiting for her change, she pressed the call button and handed me exact payment of rm7 in small notes and demanded to get her rm100 note back.
And oh, towards the end of the flight, during descent, her kid started acting up and cried as loud af. She struggled to get him to calm down while the rest of the passengers look at her in disgust.