Sure it is. Because first they start with ‘small’ things, then when you’ve gotten used to being told what to wear and how long your hair can be, you’re groomed to accept other limitations.
Anyway, I think most of the posts are a reaction to the parents and not the issue. This kid’s hair is not all that long. Jeez, look at a yearbook from the 70’s.
Please. It's a dress code. I take you are against dress codes, and most "rules". If the kid ever gets a job, which is iffy at best, he will have to learn about more rules, some of which may include a dress code. He may eventually be sent home for not showering either, considering the way the dad looks.