Gotta use common sense and understand that there's no such thing as "starting a conversation" about white racism or "enlightening" white people, especially ones you work with. My homegirl used to always share articles like these on her facebook page even though she had added almost all the white supervisors and managers at our old job. Told her ass to cool it but you know how that went. "Yall are always trying to silence black women?", "There's nothing wrong with me having a political opinion!", "They share articles and post statuses about supporting Trump, why can't I do the opposite?". They had a round of layoffs a few months later and she was the first one called into that conference room even though she was one of the top 3 performing employees in that whole company.
As shytty and fukked up as it is to get fired over something like this black people need to stop thinking we're on a level playing field. White people don't, have never, and will never play fair. Ever. So you have to move accordingly.