Only sports uniform can break dresscode

(someone reported it on a different subreddit when others were in favor of the story so thought I'd share here because I love your podcast on Spotify) When I was a sophomore in highschool this took place.

It was coming to the end of the school year and it was getting hot. Everyday was warmer than the next. So I wore a pair of jeans shorts to school. I also had a teshirt on the day of incident. So I get to school made it to homeroom as the bell rang for us to go to first period one of the teachers who was a very "by the books" person pulled me aside and asked me why I was wearing short shorts. I looked at her and asked what did she mean. She said my shorts wear shorter than the "3 fingers above the knee" rule. So I told her due to genetics what would be 3 fingers above the knee on someone else, happens to be 4.5-5 fingers above the knee for me (I have a pear shape so I have decent thighs and butt) and she had a mild flip out over my response so she sent me to the office. I get down to the office and the vice principal (who always had it out for me because I spoke out on poor thought into things) gave me the same speech. So I asked him "how is what I'm wearing so problematic? None of my peers made any comments on it. And it's really disgusting that grown adults especially a male would say this is distracting." He responded with the classic "it's against school code" so I said to him " so it's okay for cheerleaders who have basically no skirt and spanx underneath with parts of their but cheeks out and the volleyball and softball girls in tight, revealing spanx/bottoms which are shorter than my shorts that are only 4 fingers above the knee. But I can't wear these because it's so hot out?" He responded "if you have a school sports uniform, you are allowed to wear it. I said okay well I'm on the swim team so does that mean I can show up to school in a 1 piece with the school name on it? He looked at me like I was crazy and let me off with a warning. So the next day came, I wore my swimsuit I had for the schools swim team with a towel wrapped around my waist and the looks on my vice principals face and the teachers face that gave me issues the day before were absolutely priceless. Needless to say I was never bothered when I worse shorts to school ever again.