I'm assuming you're referencing the whole 1990 thing.
I'm thinking of a few instances. Yeah, there's the famous story he bragadociously told pretending to rape a "baby" while on set (the children could see ot through the monitors). One of the girls on Full House confessed that he was extremely dirty behind the scenes, had no respect for children's ears obviously — or their eyes.
There was that time the children and their parents walked in on him and his male co-stars after "taking their pants off" as a joke, whatever that actually means. He bemoaned that the girls' mothers were always screaming at him for his degenerate behavior on set, which, c'mon. And all of those child actors are super fucked up now. It's not surprising.
There're more fucked up things he did, but the one that really gets to me is when his wife delivered his newborn daughter.
So, apparently it was a really difficult birth. Risks, complications and whatnot. He was in the hospital and he handed the baby to a friend. He told this friend of his: "you can finger her for a dollar."
This buddy who was there for emotional support was jarred by this. What do you even say to that? Yeah, it was a joke, but how can you be so fucking gutter-brained? How can that even come into your head?
Saget actually got flak for this and was asked to clarify why he said that by the media. He responded with something to the effect of: "I wasn't thinking. I should've said five." So, he upped th value of his infant daughter's vagina to five dollars instead of one. Get it? Isn't that funny?
Hollywood knew what it was dping putting him at the helm of a family show. It was literally an inside joke among them all that he was cast in that role because he was known, Hell, revered for being the dirtiest comedian to walk the planet. It's like casting a lion as zebra.