"Nah. Merely pointing out you're rather 'selectively' informed"
No actually that would be you who sees racism in everything to include the Star Spangled Banner, That makes you VERY selectively informed.

"And no, I don't believe your 'I'm not white' claim" Couldn't care less. But I'll say I don't buy your kid was pulled from a cop car and beat, and if he was I doubt he was minding his business. He probably was giving he cop a bunch of grief with the same racial chip on his shoulder as you.
As for challenged? You haven't challenged anyone here you've just made accusations, justify them with "you can't cure a disease by pretending it doesn't exist" nor can you by attributing every symptom you find to it.

You certainly can't fix a single thing by calling everyone racist.

BTW, "preconceptions of racism" my error.

"As for my so-called 'preconceptions' on race, I don't even recognize the biological validity of the concept with respect to human beings. "  WTF??!!