Alienist
He stood in his suit behind the podium in preparation to win against 'the alien' who also stood behind a podium for the 'Great Galactic Debate.'
A moderator asked the human candidate first, "What do you think is our top priority in saving One Earth against the killer asteroid?"
"The asteroid is an alien scare tactic. We have weapons to obliterate it. That'll happen on day one of my leadership!" The human candidate further ranted and rambled on about how Earth was undergoing an 'open planet alien invasion,' which eventually was cut off for running over time by a moderator.
It was the alien candidate's turn to respond:
"As you know, my species emigrated to Earth, our new homeworld, decades ago because we tried to destroy a killer asteroid and nearly blew ourselves up …"
"See, they're self-destructive!" interrupted the human.
"Alienist!" a bystander in the audience blurted out, using a new post-first contact slang.