Oh, yeah, it happens all the time.
I remember I got notes back on one issue of Secret Six where they literally had to say, “Can we maybe do away with the jokes about bestiality and necrophilia in this issue?”
Also, I remember getting TWO jokes bumped from the ‘Li’l Sixers’ backup strip, the short Secret Six story drawn in the style of the Tiny Titans.
One was Ragdoll saying to Superman, “Thanks for helping me beat off all those aliens, Superman!”
And the other was, after Ragdoll made a joke about ‘duty,’ Wonder Woman hugs him and says, “You’re the Greek god of butt jokes, Ragdoll.”
Weirdly, neither of these jokes made it through, somehow.
;)