I think he's not being racist, rather intending to highlight the racism of others: "They don't care when the victim of brutality is black, maybe they'll care when it's a wealthy white man"

I didn't read it as him being racist. The wording may have been harsh, but I read it as saying that police brutality isn't something that only happens to black people.

I would think any racist feelings he had would have come to light long before now.

Could be a major head injury that is later fatal if untreated - that can cause immediate personality changes. I don't think Ian was used to be beaten regularly to withstand that...

It wasn't racist. As others have pointed out, Ian was making a statement about certain demographics being ignored when they speak about police brutality. It's very clear for those who have known Ian personally over the years what he meant (I agree it sounds weird for those who may not have known Ian very well, I guess that happened because he was in a very panicked state of mind and didn't really think how things could be taken)

I'm sure he used said language in a provocative and mocking manner, not because he was actually racist or racially insensitive. I'm sure the stress and pain of the situation didn't help him choose his words thoughtfully.