This is a difficult and emotional subject---it is human to want to put aside painful truths. When there are other personal issues you are dealing with it can feel overwhelming but you are doing it.
I grew up in a white, racist neighborhood and hated it but finding it inside hurts.
I know my son would be in jail right now if he'd been a young black man when he got busted....(I have worked in the justice system and seen who gets put away and who walks)...Remember that you are not the only person uncomfortable in your class. Everyone likely is on edge with this topic. & congrats for the A while in distress. (I had severe problems when I was in school and was surprised when I read that I graduated with honors, I was so busy managing myself I didn't realize how much information I was actually picking up and using---now I am retired after near 40yrs....yikes.
Hang in there.