Eating meat will be the big one. You look at history and meat was a rare treat, now it’s the main part of almost every meal.
People will watch media where the characters grab a hotdog on the street corner and it will seem both barbaric and decadent.
There’s probably something we are doing with children too that will seem odd. It takes a village to raise them after all and we isolate them with two parents that also have to work full time jobs. Can’t be good for either.
My family hurt my feelings, so I went from class clown to silent observer. I intended to only modify my behavior around them, but it started to spill into other areas of my life. Now I’m a very quiet person.