This is Handicap (also known as The Handicapped), by Larry Niven
Cziller's House of Irish Coffee. Inside, the place was still a cube, a
one-story building forty meters high. Padded horseshoe-shaped sofas
covered the entire floor, so close you could hardly squeeze between
them, each with a little disk of a table nestling in the center...
"Interesting place," said Jilson. "These booths were built to float...
It didn't work out. Lovely idea though. The chairs would swoop through
the air, and if two people at two tables wanted to meet they'd slide
their booths together and lock them magnetically."
There's mention of the drunks and their game
"It was fun. The guy who thought it up must have forgot that people
come to a bar to get drunk. They'd crash the booths together like
bumper cars. They'd go as high as they could and then pour out their
drinks. The people underneath didn't like that, and maybe there'd be
a fight. I remember seeing a guy get thrown out of a booth. He'd have
been dead if that tinsel centrepiece hadn't caught him. I hear
another guy did die; he missed the branches."
"So they grounded the booths."
"No. First they tried to make the course automatic. But you could
still pour drinks on the people below, and there was more skill in
it. It got to be a game. Then one night some idiot figured out how to
short the autopilot, but he forgot the manual controls had been
disconnected. His booth landed on another and injured three important
people. Then they grounded the booths."