The argument I’m making about why a system of racial preferences is bad is the standard conservative argument against racial preferences. It reinforces the racialization society and perpetuates it to the next generation. “The only way to stop discriminating on the basis of race is to stop discriminating on the basis of race.”
But the question you asked me above was different: why my view changed. The reason for that may be idiosyncratic and non-obvious—I didn’t appreciate color blindness as a social norm until it wasn’t my reality anymore—but that’s a different issue than the first point.
It’s like if someone is a pro-taxes and regulation Democrat and then changes his view because he inherits his dad’s small business when he passes unexpectedly. The reason for the change in view might be idiosyncratic, but the reason for opposing taxes and regulation is standard.
(Again, I agree with Rayiner Classic on this point, and not with New Rayiner, but that's neither here nor there.)
Make whichever argument you like. I'll only object to your use of the rhetorical frame that implies surprise that someone else would disagree with you. You disagreed with you until recently, as I do now.