I personally find this appalling, not because of the prospect of paying more or less, but because of the arbitrariness and opacity of it all. I'm not too excited for a future where we'll have to spoof various browser identities and try different times of day and VPNs to book plane tickets...
At the extreme, some people could find themselves stuck or in very difficult situations because of this kind of practice. Oh, your parent is on their deathbed? Shouldn't have said that to a friend on Messenger or WhatsApp.
And I don't understand what could possibly justify personalized pricing (towards consumers, not businesses) of non-personalized goods and services being legal in the first place.
And also point out that AI driven price discrimination isn’t anywhere close to negotiated. You’re stuck with the price the machine gives you, with little to no recourse, short of rewriting your entire digital life!