Being called sir

Tell your people to ctfo since they're the cause of the embarrassment. As someone who also tends to look fairly androgenous I understand.

I'm not sure what to say except that when people laugh inappropriately it is usually because they feel uncomfortable with the situation they are dealing with.

Possibly they make fun of you in order to reassure their own minds that you are not a threat to them or their mental well being which feels threatened by you being "different".

It could be a sign that their minds are weak or immature or maybe you simply caught them totally off guard and laughter is their way of normalizing the situation again.

Their inappropriate laughter shows a failure in their minds and not in yours. I think your lesson is maybe to learn to be understanding of how uncomfortable you make certain people feel. Either way whenever this happens you will learn something and so will they.

Do you like your presentation? Are you comfortable with their mistakes? Are you uncomfortable with people correcting them for you?

Just be honest I each case. Laugh it off or tell them you like your boy side.

I used to work in retail with a woman who looked like a guy. One evening a boy, about 10, walked up and asked her a question, beginning with, "Excuse me, sir." When she answered him with a very female voice, his eyes got big and he turned around and ran. And I mean ran! I tried not to laugh, but I did.

Obviously by it happening so much, it's gonna happen unless you make it more obvious that you're a woman.

Well when I still had long hair I was mistaken for a woman before. I found it amusing because they would start panicking the minute I would turn around. :)

Dress more feminine from the neck down is a solution.

Sarcasm works best in situations like that.