British Airways asking for 'gender on passport' at online check in

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My passport cites my sex. ( I wonder for how much longer)

Oh yay. And you are forced to fill in the field correctly, otherwise you cannot fly.
I've got a BA ticket for April, wonder if I should rebook ?

Yep no other option!

I know it says "Sex" on the passport, but given that so many countries now allow people to change from M to F and vice versa * plus, in some cases, to use the nonsensical X, what is actually on some passports is indeed gender and not sex.

*Including the UK, no GRC required, just a doctor's letter will do

"what is actually on some passports is indeed gender and not sex."

Oh yes, I am in Germany, so we have "gender" on our passport (well, it says sex, but the law says gender now)...