Why do you think, in general, that people dislike long hair on men?

So my brother started growing my hair out six years ago and it's around waist length now (there are pictures on my profile if you'd like to see / give advice) I've noticed over the years that neither woman or men really like it; despite it being just hair and that it should not matter.

Why do you think that is?

Why do you think, in general, that people dislike long hair on men?
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