There are lots of funny comics - Johnny Ryan, Ivan Brunetti, Rick Altergott, Michael Kupperman, Tony Millionaire and Daniel Clowes all do funny stuff, at varying toxicity levels. Lots of others do stuff that's 'fun' if not 'funny'.
I agree that most mainstream comics are awful and self-serious, but I love the old-timey superhero stuff. Back when Bam! Pow! Comics were just for kids anymore, and as a result they were silly and fun. Silver Age Superman comics, for example, are weird as hell.