Can I tell a shop assistant to leave me alone?
Why would you tell him to leave you alone?
It's quite easy. I just forget what the word 'please' means and I need to tell everyone off for everything.
It's not very nice to tell someone to leave you alone. That may upset them.
It's not my fault they can't handle my unapologetic self and also I forgot how to apologize.
I don't think that you forget how to apologize? Just don't be rude to people, because word may spread and a lot of people will think less of you. Just don't be rude and tell people to leave you alone.r