Well unless you going for that "Dad Bod" fad, then yes it's an insult. When I hear "dad jeans", it translates to ; "I don't need to look good, just be comfortable." Unfortunately, some men, just don't know that other cuts or styles will look better and be just as comfortable as relaxed fit. Look at this photo of Obama:

The relaxed fit just says I'm lazy (and no one likes lazy).
Don't get me wrong, he looks alright, but a slim fit pair of jeans would have done him way more justice.

Thanks for reading Alexbarkerart!