What about, "I have to deal with daily racial discrimination, and today, on top of that, you are challenging my feelings that arise not only from a specific incident of pronounced racial tension but are compounded by that daily racial discrimination as well, and yet again someone who doesn't experience what I do (and may or may not even believe my experiences) is asking me to justify my emotions on the topic, and today it's just too fucking much?"

Or is that just "I'm sick of discussing this" ? Because the thing is, it's not black people's jobs to stop everything, sit down, and explain their daily experience to you just because you ask. Because you are privileged enough that you have to ask instead of know.

Yes, it's great to try and have open communication about race with people who actually regularly experience racial injustice, but especially on an emotionally heightened day and event like this, maybe asking them to justify their feelings (that have already been through the wringer) might feel like a little bit too much.

If a guy I'd had a really tormented relationship with and I had just broken up, and someone then asked me to justify being upset with a seemingly unsympathetic view, yeah, I'd nope out of that situation as well, or I'd end up in tears, or ticked off. It's reasonable sometimes to decide that a certain type of discussion is just too much at a given time.