"Yeah, I know." The Doctor just doesn't work on the same level as ordinary human beings, or even immortal human beings like Jack, who isn't exactly ordinary in any way.
He nods vehemently at the racism comment. He lived through the sixties too and okay, he's not black, but... "And a lot less prejudice against omnisexuals too! You know, the sixties - for that 'free love' crap - they were a terribly straightlaced lot in some respects too!"