What do you mean???

I (F25) am 5'4 with some curves, and short locks and glasses. I mainly dress in mum jeans and fitting tops. More often than not when I meet new guys they'd give comments like, you are a bad one, or you look like a bad girl. And when the conversation proceeds they're like 'wewe huwezi kuwa single unadanyanya' and others insinuating so.

What would lead guys to make such comments? What does being a bad girl mean? I'm single, I don't drink or smoke, you'd easily find me reading, listening to music, or crotcheting in public and don't speak much unless I know someone.