Humans love to rhyme. We love when things sound sing-songy because we love to say them out loud. Think of all the phrases in the English language that really only exist because they rhyme. Hippy dippy, for example, takes the hippy down a peg by also suggesting that they're a bit of a dip. Fancy schmancy and hoity-toity are both ones that use completely made-up words just so we can have rhyming phrases that suggest that something is a little rich. And lest we forget "float someone's boat" which conveniently rhymes and is also an elegant and whimsical way to say that somebody likes something.
This is the fun of the English language. We get to be a little silly with it sometimes, and it's perfectly culturally acceptable. Using those phrases makes us feel like kids again. Looking at memes also makes us feel like kids again. So why not do both?
