They're not popular, but going outside in a flurry of missiles isn't good for your health. It's not like the US has coordinated with anyone on the ground to plan a revolt. They seem to have just imagined one will materialize.
They still don't love the regime but today they share a common enemy.
This reminds me of the US soldiers after the Iraq invasion not understanding why the population didn't celebrate them as liberators. Even young Iraqis initially optimistic about the future were quickly disillusioned by the reality.
Two full decades in Afghanistan "liberating" the Afghani people from the Taliban, when you left it took less than a day to undo with zero resistance, that's how much the population appreciated your efforts to "bring them liberal democracy".
I suppose it's because the US public never had to reconcile their fantasies with reality in quite the same way as them.