Am I the Asshole?

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The original was posted on /r/AmItheAsshole by /u/NecessaryCorgi87 on 2023-06-25 15:20:22+00:00.

My SO and I had a disagreement this morning. For a while, our toddler had dressed themselves and I let them do so - they are currently 3. One of their favourite things to do is to wear mismatched socks. I personally find it to be a form of self expression and it makes them happy. They don’t go to a school with a dress code so my thought is to let them be a child. My SO lectures my child repeatedly about it being silly and inappropriate and today, I called them out on it and they got mad and said, well it IS silly. AITA for calling them out and quote on quote “taking my child’s side” on this? Like I actually don’t know what the big deal is. Help me understand the other side of this equation. Thank you.