i have been a really polite person, but yes that means smiling and laughing if pepole treat you like shit, which is lying.
I have been polite until the age of 12, but as I encountered it people get it wrong all the time, mistaking your politness as invitation for harming you.
Eventually I stopped, became the opposite. I've walked up to people to tell them I don't like them.
this article motivates me to reintroduce a little fake politness. it certainly has its upps