If I can change my sex, why can't I change my race?

Race is highly emotive because of the historical and current discrimination that is endured by minority race communities, especially black communities. Identify yourself as whatever you want, but IMO, don't expect me to believe that we are the "same" and that you've walked a mile in my shoes.

I'm saying it IS a social construct

(Sorry got distracted)

I'm saying it's not a social construct because it lumps massive amounts of people to together in a not very scientific way because who is and isn't black varies by culture.

Is race a social construct?

Mixed race is for more common than intersex. People who are intersex nominate the sex they want to live as, so in OP's case then yes just choosing is possible. Because intersex people usually have their sex assigned to them by their parents at birth, but it might well be totally wrong for them and they choose to change later.

In other cases, then yes it is also possible, and acceptance by the community is the. Key point.

Did anyone ever really consider Hayley Cropper a man? Other than of course people portrayed as bigoys such as Les Battersby?

I've never understood this. Race is a pretty made up social construct and it's waaaaay more wobbly than sex or even gender.

I'm mixed race so I don't fit into a box easily, I'm often asked why I'm not more black or it's commented that I'm very white.... That's nothing to do with my skin colour (though I'm relatively pale as I don't go outside that much) but it's to do with how I behave relative to racial stereotypes.

On the flip side I'm often put into the category of black because I live in a white country, grew up in and live in very white areas and I'm not like the majority so I must be the other (it's a shame that it always black v white and skips over the other races). I've never been to a mostly black country before so I don't know how I would be seen there.

I often describe myself as grey because it's a bit more descriptive than mixed race and just to increase my awkwardness of not fitting in a box. I'm fine with being mixed, I don't think most trans people are entirely one or the other gender, like I'm not entirely one "race" so why can't they just be who they want without the whole uprising thing (bit of an understatement). They can't change their sex any more than I can change my ancestry the makes me mixed "race".

In Australia, where we systematically tried to kill all the Aboriginals or if that too unseemly tried to breed it out by taking light skinned kids and telling them they were white, one for the markers of your aboriginality is if you are accepted by the community as aboriginal.
In areas like Tasmania when the last full blooded aboriginal died in the 1870s many aboriginal people look quite white but they a seen by their community as black. Similarly I have white friends who through marriage become "aunty"s and "Uncle"s and are considered part of an aborginal family.

There is also a guy in NT who is Scottish by birth but is considered Yolngu by his Yolngu family and community

So the short answer is if your family and your community consider you black then maybe you are.
As for trans changing sex given that lots of women are saying we don't accept that you are women I'm not sure they can say they become women

Why do so many white people claim to be Native American? | Fusion
fusion.net/story/279637/white-people-claiming-native-identity/

oh in that case go for it
am feeling a bit mentally underpowered right now, but I think there's some mileage in comparing race with gender (but not sex)- as race is an arbitrary social construct, like gender, whereas sex is an objective biological concept.
The woman who claimed to be black was derided, rightly so because 'race' is the source of real oppression- but sex is also the source of real oppression, with gender being a tool for the oppression
or something

actually we ARE all africans