People
Immigration is the sincerest form of flattery.
— Jack Paar

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A joke that swaps one word into a famous proverb. Imitation is supposed to be the sincerest flattery, so the speaker suggests that people who move somewhere are paying the place a compliment by choosing it. It's a playful twist on the original saying.
Context reviewed