Brit here.
That's simply the British way of "calling you out" on your bullshit. Had you given a legitimate reason not to be scanned (and I can't think of one offhand), then I assure you, they would have been quite nice and helpful; certainly so in comparison to American standards of airport security staff!
This is my fear - what happens if the AI companies can't find a path to profitability and shut down?
I live in one of those countries, and I don't think I've ever had to use it to communicate with someone on another continent. I think most of its use is simply local, for your community or friend group.
The downside for me is basically the lack of appeal for a non-tech user (like my parents) to voluntarily want to stop using an app they've been using for, what, 10-12 years? It’s not that big of a deal; everyone uses Instagram or Facebook (maybe)... WhatsApp is definitely going to make the process difficult, too.
Day 100: Wikipedia is shut down