you said "not all lives matter until black lives matter" implying that other lives don't matter "until" black ones do, not in addition to other lives
black people can be racist, anyone can be racist, same as anyone can be sexist, or anyone can be homophobic.
i don't get triggered by the black lives matter movement or by people saying "black lives matter" , but i still think that saying "all lives matter" is better than just saying only one race matters.
there are also videos of black people being triggered at "all lives matter" signs and t-shirts which is racist.
i know what your stupid government could do, take away weapons or making it a lot harder to get one for a start
i don't use my "white privilege" to justify anything, if something / someone is racist, that is racist, no matter of colour, religion, sex, gender, whatever....
so using your definition of racism no one can be racist, white people were and in some cases oppressed, black people were and are oppressed. same for every colour