Fuming at the police

The police pulled me over saying I had crack near my steering wheel. They tried to tell me it’s class a when all it was was flour I spilt when my son wanted to make a cake. I think they were discriminating and being misogynistic on me and I want to sue cos they were proved wrong. Like yeah I had class b on me but can they sit there and say it’s class a when it’s not and arrest me for dealing anorl. How do you know it’s not for myself. A tiny bit of class b.