Yes, she did bash it; often and with enthusiasm.
She didn’t even bash Christianity “often and with enthusiasm”, and that’s certainly the worse of the two.
She saw it as unoriginal tribal mindless nonsense.
Yes she did say it was tribal, and she did disapprove of it, but she didn’t call it unoriginal, mindless, or nonsense. When she did express her dislike of folk music, it was a kind of disappointed distaste, not vehement hatred one might deduce from the opinion above.
What’s happening here is that, instead of trying to accurately transmit what AR said on the subject, you’ve taken the liberty of speaking for her, and making judgments that in your opinion she might have made. That’s uncalled for. The poster asked “Did Ayn Rand bash folk music”, not “Does The Inspector bash folk music”.
Folk music, while primitive and bland, is not the penultimate evil in the world, but if you hold a different opinion, that’s your prerogative, of course. However, when someone new to AR will come to this thread and read what you attributed to her, he will think, “Yikes, Ayn Rand was a pretty mean person”, while the truth is that this describes only you, and no one else.
This is how misconceptions about AR’s person, values, and opinions are spread, and why some people new to the philosophy get turned off by the negative image of AR presented to them. The culprits are overzealous students who blur the distinction between her opinions and their own.