(Ridiculous was a tad too strong)
I just don't find the "it's a joke" distinction all that meaningful. There are racist jokes! There are jokes that communicate awful, hateful things! Comedy isn't something that minimizes the underlying messages it communicates -- often, it makes those messages much more potent and dangerous. I think comedy is one of the most dangerous, potent political forces there is.
Look at Milo. His whole schtick is "everything's a joke." That's the alt-right's knee-jerk defensive crouch. Well, that's not good enough. Irony, comedy, etc. is speech just like any other speech -- and it holds power and meaning and can be dissected and criticized in an intelligent manner.
I think it's meaningful from the point of view of you yourself need to be able to read/see/hear things and assess how much of an imminent threat they
actually are. I'd like to think 95% of the population could see a PDP video and at worst think what a fucking idiot/is this what the
kids laugh at these days? Why? Because your brain deciphers it is someone in front of a camera
trying to be funny, not an actual criminal or dangerous person. Speech is important but it is still separated from actual actions.
Maybe the real issue of modern times is crude/insensitive humour isn't locked away behind 15/18 rated DVDs, but literally 15 seconds away from clicking an internet browser and doing a google search/YT search. I'll admit that is a challenge of our times, but again, I see good parenting far more important than being too paranoid every young person who seeks a sick/twisted joke is going to go mad and actually be a genuine threat. Some are, but that's life, there are bad people out there and we do our best to prevent them from doing anything.
Even taking away the internet, some kid on the playground back in the day always had some edgy joke passed down from an older brother/sister and ran around the playground telling it to all the other kids for a shocked reaction. Parents and society have always faced the realities of shock humour, albeit it may well get to the eyes and ears of most a lot easier/quicker in today's retweet/repost internet world.