That's not exactly it. The only informed response about a black person's experience on these platforms is a black person's. When people talk about "lived experience," the implication is that empathy is practically impossible. The best you can offer is sympathy.
> I've been on the receiving end of racist remarks offline
I am a white person who has been on the receiving end of racially-motivated police brutality. Even though it was racially-motivated I would not consider it a racist act. The fucker was merely angry at white people, that's different to racism. While there are places on the planet where white people experience racism (typically at the hands of other white people), I can almost guarantee that you have not - especially if you are American.
Don't wash the black community's suffering with white experiences.