Depends 
Ik ppl writing romance when they’ve never experienced it. Ik ppl writing abt being at college when they’ve never experienced it. These topics for example u can do as much research as possible & get inspiration off others works to try make it realistic.
And yes, u can describe racism taking place. however, u cannot try describe the emotional feelings of somebody experiencing any type of discrimination if u haven’t felt it urself, it just wouldn’t b realistic. as a white person, u might’ve seen someone subjected to racism at some point in ur life, I guess writing it from the observing POV is ok, however imo, adding it would still seem unnecessary.
and basically as a white person u r fortune & privileged enough to never experience discrimination due to race, so just accept that due to that u could never accurately present it, ok? I have to b honest, I would b offended seeing someone writing abt an Ed if they haven’t experienced it, they would honestly never understand the suffering. So yes, sum things r so emotionally challenging, to b able to write abt them & present them in a non triggering & offensive way, u must have experienced it. Just accept that.
u can start saying ‘fReeDom Of SpeEch’ and that fine, u have freedom to write abt it, but note that writing abt something u need to have experienced to accurately present having never experienced will mean the final outcome is offensive & inaccurate, 