Because a Prius isn't a particularly 'cool' vehicle (my step-son and his friends detest them, and they're pretty into cars), and were widely used as taxis (at least here in the UK), so they have an image problem.

Full EVs have a much better reputation with them - even something like my Renault Zoe - because they have zero tailpipe emissions, and even the Zoe is pretty quick and super-smooth in comparison to a comparable ICE vehicle.

We’re in a completely different cultural moment now on climate change, and modern EVs are quite unlike the Prius.

It kinda happened, South Park even made an episode about it!