What on Earth does he mean?
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Comics I Don't Understand 
Not familiar with the characters names, but yellow shirt is complaining that super hero movies have become unrealistic. Red shirt sarcastically points out that they never were realistic. Yellow shirt interprets sarcasm as a “dad joke” and mentions that’s the problem - dad jokes (in the movies, I presume) make it so you can’t suspend disbelief.
I think chemgal is close @1, but the “dad jokes” are not present in the movies. Yellowshirt is simply interpreting Skip’s obtuse non-acceptance of the fundamental “physics” of superhero universes as being as lame as a “dad joke”.
P.S. Gene Weingarten is continuing to place “grandpa jokes” in Barney & Clyde:
I dunno, the dialog in the third panel is still very weird. And it’s “suspend disbelief”; “suspend imagination” is not a thing, nor can I imagine why you’d want to do it, and it’s hard to tell if that’s part of the joke or if the author just used the wrong word.