
It just depends on the situation, really.
If it was something slight and likely an accident or something unintentional,or something I know I'm being somewhat irrational about, I ignore it and try to forget it.
If I think it was intentional and the person is toxic all around, I try avoid them and cut them out of my life entirely if they prove to continue to be a problem.
If it was a someone I care for and a friendship I deem important and salvageable, I talk to the person, politely and calmly as possible tell them what they did to upset me and try to work things out.
If it was something slight and likely an accident or something unintentional,or something I know I'm being somewhat irrational about, I ignore it and try to forget it.
If I think it was intentional and the person is toxic all around, I try avoid them and cut them out of my life entirely if they prove to continue to be a problem.
If it was a someone I care for and a friendship I deem important and salvageable, I talk to the person, politely and calmly as possible tell them what they did to upset me and try to work things out.