A few more sceptical voices brought this up, and were told repeatedly that it didn't matter because the Kurds in Syria and Turkey are very different from those in Iraq & Iran.
And there's certainly something in that - but it ignored the clunkingly obvious point that, if America had been thinking at all strategically, a bit more support of Rojava and would have demonstrated to all Kurds that "looking west" would be rewarded.
It has to be hard for Americans to realise that their government has pissed so much of the world off so badly. I suspect we'll see further such errors in analysis and response before the new reality fully sinks in.