Is it normal that i was wrong for thinking this?

Previously I posted this:https://www.isitnormal.com/post/my-thoughts-on-wanting-to-be-underweight-is-building-up-295628

And I felt it was wrong for me think about being underweight.

But then the message from Every Damn Day Fitness was echoing: Fuck being fat!

Its time that I accept I was wrong in the first place.