Opponents of diplomacy can pretend that this has something to do with standing on principle, but it is really just vanity.
The idea that we care in the slightest about protesters is a joke. We abandon diplomacy because we want to abandon diplomacy.
Principles have nothing to do with it.
It's not an abandonment of diplomacy (the last administration did that amply) but a strategic pause, predicated both on the uprising and Iran's ongoing military support to Russia.
That's simply realpolitk as it stands now. There is, of course, behind the scenes dialogue that takes place almost daily, the less visible machinery of 'jaw-jaw.' Let us see how the protests play out and how it affects the regime over time. The sheet amount of celebrations after Iran lost to the US is a harbinger of change.