AIBU to challenge the school’s wording about pupils rolling skirts up?

There are boys who choose to wear skirts at some schools OP, nothing to do with transgender or whatever else you're offended about. There was one in the news I think it was last year or the year before. I think it's only fair that this rule apply to anyone wearing a skirt, not just girls. Most uniform rules disproportionately affect girls.

FFS. Parent your child and don’t moan at schools. Rules are rules. Follow them or find another school or home educate.
there’s enough shit to deal with without complaints from parents about entirely reasonable things.

Why do some people refuse to accept that girls showing their bodies is likely to attract unwanted attention? You can call it sexist all you want. It's still true.

I work in a school and honestly? I’m fed up with trying to avert my eyes walking up the stairs behind someone in a really short skirt. If I can see the darker top part of your tights your skirt is too short. Or your knickers. Nothing to do with sexism or boys, it’s not a good look. Have some self respect.

Ordinarily I would have agreed with you on the wording, but some of the news recently has been worrying.

if general public have complained then it does need addressing

I only have boys at the school not girls but want to write to the head to point out how utterly sexist this is.

How is it sexist? It doesn't specify girls. It refers to pupils who wear skirts.

is this not clearly implying that short skirts = making themselves vulnerable and if is, then if anything bad happens as a result it is their own fault?

No, it's saying that members of the public don't want to see schoolgirls' knickers and arses. Or anyone else's knickers and arse, for that matter.

The message could have been clearer

What do you think it should have said?

No I wouldn’t complain. My child’s school has the same problem with girls rolling their skirts up so high that knickers are on display at the back. It’s such a problem the school are considering a uniform change to trousers only.

I agree they could have phrased the bit where they ask parents to speak to their children about 'why it is not a good idea' a bit better.

They should have said 'why it is not appropriate' instead.

The way the girls wear their skirts around here, they may as well not be wearing one.

Having seen literal butt cheeks of girls going to the local comp here, I wish to God they'd sort it out. I don't want to see any kids bum on my daily commute. It is inappropriate and reflects poorly on the school. I'd feel the same if the boys had their bums hanging out.

Nothing about making themselves vulnerable; just that the general public don't like seeing their arse cheeks on display.

This. Nobody wants to see these girls arse cheeks hanging out the bottom of a "skirt" that barely qualifies as a belt. Its scruffy.

There is so much peer pressure for girls to roll up their skirts that strict rules protect those girls who really do not want to but do to feel included. The message could have been clearer but living next to a secondary school there have been incidents of photographing and as it's from behind it's not classed as up skirting.

How should they have phrased it?

As a man in his 50s I'm not attracted to teenage girls or any female under about 45 to be honest. But I'm fed up, as I have to pass our local comp, of seeing Monday's washing. It's not pleasant... please don't say look away, because I would walk into one of the dawdling beggars as they walk 5 abreast on the pavement ahead of me.

If its anything like some of the girls around here then its literally your arse showing. I think that it isn't a good look and nothing to do with boys being unable to control themselves just taking a bit of pride in yourself and your school.