20ish years after my mom and dad were wearing bell-bottoms, I was wearing bell-bottoms. And now, 20ish years after the 80s leg warmers and skinny jeans were cool, I'm wearing those. This recycling of fashions is acceptable because I wasn't alive to see the original hippie bellbottoms or original Flashdance stuff in its heyday. But you can't bring back everything. It would NOT be acceptable to wear a bib or a pacifier just because I had used those 20 years ago. That makes sense, right?
Likewise, it is NOT acceptable for Jason Derulo to bring back a Raffi song. It is NOT okay for people to be grinding to a song that we were all singing when we were 6.
Let's examine some of the differences:

At this point, Jason Derulo just comes off as annoying and sort of sad, like a really bad American Idol audition where you know Simon Cowell (or J. Lo, apparently) is going to tear the poor guy apart. But THEN:

* On a side note, SNL had no business making fun the most emotionally charged episode of the The O.C.'s second season. Marisa shoots Trey which leads to her getting arrested which leads to her getting expelled which leads her to break up with Ryan for the 234th time which eventually leads to her DEATH. Which leads to the demise of the entire show, which leads to me not having anything to watch on late nights. :(