"I don't know why people are talking about this guy. I've never heard of him. And you're saying he's going to be the next President of the United States? That's really messed up seeing how America is entering it's first interim period without a President. The country is in a tough spot, have some respect."

Yes, it does seem childish. In fact, it sounds like something a smoothbrained leftist might even do. Their mistake was in saying "Donald Trump is not my president". By invoking his name alone, he is calling him into existence.

This strategy, on the other hand, is a one-two punch. Not only are we making the same statement that the leftists have made, but we would be taking it a step further by denying his place in history. In fact, many of the leftists are committing to the very same course of action because of their blind hatred towards the "Orange Man". Even the few people that actually did vote for this individual don't even care too much for him; they will soon come to realize this as well and relegate him to the dustbin of history.

If you don't think this has ever happened, look at a monarch by the name of Akhenaten (https://en.wikipedia.org/wiki/Akhenaten). After his death, all historical or documented instances of his name were completely erased from history; it was not until the early-to-mid 20th Century that we figured out that he was an actual person.

Of course, this is all my opinion--I could be wrong. Just sharing a thought, not a serious recommendation.