Today I was asked why I chose to write with my left hand

So I was in school and we where given a small group project where one of us (group of 3) had to write. So I said if I would write no one would be able to read it, because my handwriting is bad as hell and everything would smear. Nobody else wanted to write so we had a little discussion and this girl goes like: "Why did you even chose to write with your left hand?" Then I answered in disbelief: "Im lefthanded!" and I kid you not, but she said "Yeah, but why?". So are there realy people who don't know leftys exist?

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(Sorry if my English is bad it's my 5th language)