Q: Why are Mustangs made fun of worldwide, even though they are most likely the best selling American muscle car?
A: Mustangs are not derided worldwide as much as they are in the United States. The criticism is limited to the years when Ford took their eye off the ball and ignored the competition.

Exempting enthusiasts who souped up their cars, the Mustang is a “pony car” and by definition not a real muscle car.