That's a popular trope that is spouted by anti-rationalists all the time, but it's a total red herring. It's one of those rhetorical tactics that is designed to disrupt judgment and put a stop to a conversation before the absurdity of the claim is made obvious. It's drilled into us as children through tv, movies, even books, but it's entirely false.

Rationalism has plenty of room for fantasy, emotion, and everything else that humans experience. It's not a choice between being rational and being a fully developed human. The choice is between being rational and being irrational. Everything else is its own separate thing.