Oooooof. No, this post and the reaction you're describing aren't stupid AT ALL. First off, there's objectively nothing scary about that video. It's hilarious, and it does a great job of joking about a very common phenomenon without denigrating it or the person experiencing it.

Given your history, it's especially bizarre that your therapist made that comment. But it sounds like you and he have a long productive track record together, and I really hope he's able to recognize his error here and work to repair it with you (and from what you've said, I'm hopeful he will).

But yeah, you have absolutely nothing to apologize for and no reason to feel stupid for feeling this way or making this post. I think I'd feel the exact same way in your shoes.