much chit-chat is on the 2 meter bands they'd be using from 10,000',
where they'd get much more range than the hams on the ground? Does that
bother the hams?

The hams will probably go ballistic.

Not in my experience. When hang gliding on a non-XC flight I kept my
radio on lowest power setting because anybody I wanted to talk to was
within a few miles line of sight. On the days when we got to 7k - 10k
AGL hams 30 miles away could pick us up. Most of the reaction was
friendly. They were curious about antennas and about hang gliding.
The only unfriendly reaction was to folks not using their call signs,
or not having callsigns. But that's the same unfriendly reaction the
unlicensed users got when standing on the ground.