I was always getting mistaken for a guy. Admittedly mostly from the back.
I found it amusing.

When my nephew was about 4 years old he asked me if I was a man or a woman.
( girlinthehole, Wed 28 Apr 2010, 15:25, 1 reply, 16 years ago)

Is that better or worse than being a guy with long hair
And being mistaken for your mate's girlfriend*?

*_{By a doctor.}
(LongJohnBaldry, Wed 28 Apr 2010, 15:25, Reply)

If it was a gyny - worse. Much, much worse.
Sad reflection on state of our NHS, etc.
( Larry Vest One day at a time, sweet Jesus, FFS., Wed 28 Apr 2010, 15:37, Reply)

I was once nearly denied entry into the USA
'...but this is a lady's passport, sir'

'A LADY CALLED MONTY, YOU FUCKING SPASTIC?'

'Oh, sorry sir'

In his defence the photo was from my long-haired days and at that moment I had a grade '0' skinhead, but still...
( Monty Boyce, My cheese game is strong, Wed 28 Apr 2010, 15:45, Reply)