Grumble a lot for a day and curse them with my dolls~. After that I try to forget, which is easier said than done. Being angry gets you nowhere unfortunately.
Do not worry, everyone of us does. It is just difficult to perceive, but we often do little things that offend others. Everyone has their grievances that they digest.
I have a friend like that too mn, we fight over the silliest of things ah. We once had a super heated debate over the phrase 'Squares are not rectangle"