Manners are all based on those around you.
My wife, son and I fart all the time- sometimes ON each other. We even put our elbows on the table while eating Big Macs.
I don’t think manners matter- most of them are bullshit that was created to please the world around us.
I think it’s more important to respect those that deserve it (and NO- everyone doesn’t deserve it) and I think it’s important to be nice, friendly and try to be as kind as possible to each other.
Being a decent human is far more important to me than “manners”.
Love, Peace and Sharkyness