your friends of color will notice the way you respond differently. they will notice the way you take a more hostile/defensive tone with a person of color versus the more forgiving/understanding tone you take with another white person for saying exact same thing you disagree with.
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Stuff like this still being engrained in people makes me go bald
your trans friends will notice the way you respond to them vs. responding to cis people
the women in your life will notice the way you respond to them vs. the way you respond to men.
it's a subtle thing, sure, but none of us are stupid.