This is what Miles was talking about - the idea that Black people are supposed to just keep moving along as though nothing is wrong, when so much is wrong. At the root of it is white people not wanting to be made uncomfortable. He wasn't OK and said so, as well he should have. Yes, a Black man being murdered in the street by state agents is a downer, but the problem is that it happened, not that Miles is upset about it. He, and we all, should be upset about it.
I didn't get this either and if there was mention of testing, I missed it. Stay-at-home orders lifting and things reopening are, frankly, meaningless from a public health perspective; the pandemic hasn't gone anywhere, as evidenced by the uptick in cases. I had the same thought when Henry and Woody were talking at Henry's place (or it could have been Woody's; their apartments are identical) - clearly they were aware of COVID since they elbow-bumped instead of shaking hands or bro-hugging, but then why are y'all indoors, like 18 inches apart, with no masks?
I would have been done with Christina when she happily (IIRC she was smiling in that flashback) announced that she used to lie all the time and she likes drama. That is a personality type I stopped dealing with long ago; she's too old for that shit.