When most people claim that language X is "not cool" it's a defense mechanism. They do not know or have no interest in learning X, so it becomes worthless and

When most people claim that language X is "not cool" it's a defense mechanism. They do not know or have no interest in learning X, so it becomes worthless and uncool to them. Spend more time focusing on theory and less on stack. As for stack advice, pick what you want to do.