It is actually far more adult than what most 8 year old could come up with. There is a meme'ish satire element that the average kid would not really be picking up on or think up. And in this case it in reaction to the bullshit newscaster trying to cover up what was really said. So the entire phrase is also a commentary on legacy media censorship and lies. The dumb fucks who don't like it just see it as a replacement for 'fuck Joe Biden' without fully understand the layers of meaning behind it. They are the ones thinking on the school yard level and can't see the nuance.