I almost said reee to my mother
Why would you consider saying that to her?
I almost lost my cool when she called me a slut
It's good that you decided to hold your tongue. Although what she said was hurtful. The situation would be worse if you reciprocated the disrespect.
Wtf I don't care about her opinion anymore.
It's understandable that you are still hurt by what your mother said. It's best to take sometime to think about what lead up to that moment and try to understand her mentality about it.