"if I were you". When I was younger I lack the ability really consider others' situation and put myself in their shoes. Not because I thought I'm better than them but thought I see a better way. I don't exactly remember when I stopped using it but I'm pretty sure it's around when I realized I would beat the shit out of me if I was my own child.

The same as OP

Tubular.

I've never encountered anything I would describe as "tubular." Except maybe tubes. It just doesn't feel right as general slang.

I'm mostly succeeding now at not calling another driver "he" by default. I don't know who they are, and can call them something better, as I just did.

"You got gypped"
Always just thought it was the same as being "ripped off" or getting a bad deal. Only in recent years realised that it was in reference to be swindled by a gypsy. I still wondered if the term gypsy was more to do with the lifestyle of the person, like a nomad, and not actually racist but no, gypsies origins are as Romani people. Have since stopped using the term.
Urban Dictionary has a bet each way as to if it is/was racist gypped/gyp't but best not to use it I think

I used to eat meat. Don't anymore because the arguments against it are just that fucking strong. Basically unless you advocate for religious supremacy it's hard to make a cohesive argument in favor of meat consumption.