"come back when you get your period" is pretty sexist

It is, but in this context the intent is to indicate when she's "reached maturity," which is age-related.

Don't get me wrong -- no one should be picking fights with eleven-year-olds on Twitter in the first place (and I'd venture that most eleven-year-olds shouldn't be tweeting anyway), but in this case they're calling out the offending tweet for the wrong reasons.

LeN, I don't think I'm being naive thinking that being gendered and an insult (it is both) doesn't mean it's sexist. Because if they'd been trashing Jaden, I'd imagine they'd have told him to come back when he can grow a beard. You absolutely can't know. Like msbelle said. I mean, Bieber gets too young shit tossed at him too. I don't know what the volume of each is, but it's not like being a rich white kid is exempting anyone from criticism.

I have to say I felt similar emotions when Avril Lavigne, all of nineteen or whatever, referred in an interview to her album as "Something I've been working for my whole life," and I kind of like Avril Lavigne, but still? For half a second I was thinking "Just die, Avril," which makes me glad I didn't tweet that.

Hey, Jilli! Is this: [link] of any interest to you? It fucking rocks, that what it does.

makes whimpering noises at the laptop

I wants it. Or a reproduction of it.

I wants it. Or a reproduction of it.

If you can't find reproductions, I'll arm wrestle you for it.

The person did not hurl a neutral comment: "come back when you are adult" which would be firmly ageist and nothing else. The person hurled a phrase that to my eyes is pretty sexist. I get your points above, but by intertwining both things, I read it as sexist and ageist.

The racism part isn't apparent from that one remark.

Does it matter if it was a man or woman who said it? Because that seems like a phrasing more likely to come from a woman.

I firmly believe women can be sexist, so in my view, no.

Granted, LeN. Now I'm curious as to the likelihood of a man linking a period to maturity. I know too many appalling sorts that would be using a different type of milestone.

Yeah, for me I can only go as far as gendered insult. I know some people think those are as bad as a sexist insult, I do not agree. At least, not in that example. I don't feel she's being told to shut it because she's female. Or that calling out menarche is offensive or belittling. She's being dumped on because she's eleven, in my read, not because she's she.