I'm 42.
And I think the policeman's request was reasonable.
And I believe refusing a reasonable request from a policeman means you deserve to be made to comply.
The cops instructed him to get up and go with them. He refused. The cops could either bodily remove him by force, which would have been far more dangerous, considering there were stairs involved.
Zapping the kid was a reasonable, measured response.
And dammed funny.
"Don't touch me!"
ZZZZZZZZZZ.
"I said don't touch me!"
ZZZZZZZZZZ.
The kid seems to have trouble learning from his mistakes! Did you ever see the Simpsons episode about Bart learning slower than the hampster?
In a previous story, Dennis The Peasant here (see Monty Python and the Holy Grail) was actually told to leave and there was time that elapsed before the police were brought in.
Well before he was tasered, he was ignoring simple instructions.