Honestly don't understand why you'd say it's embarrassing to bodybuilding. It's a hobby/lifestyle for many people. Your ignorance is kind of humerus, it's almost like saying being a vegetarian is embarrassing or saying people who are proud if their own achievements are a joke.
Why not just let people, be themselves? It's a lifestyle choice and they enjoy it.
For the record, I don't do bodybuilding, although I do go to the gym. I'm also not a fan of being so massive you look like an coke can on two straw legs topped by a peanut for a head, but I respect that doing that makes some people happy.
Edit: Apologies for spelling mistakes/grammatical errors, autocorrect is annoying.