My brother said this to my sister. Is he making fun of me?

my younger sisters starting high school soon and our brother said yeah be friendly but not too friendly with the boys like Tiff (me).

When he says don’t be too friendly with the boys, is he making fun of the fact that I got pregnant my junior year? Because I was never too friendly toward the boys so I don't know how this makes sense unless he was making fun of what happened to me
Yes that’s what he meant
No that’s not what he meant
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My brother said this to my sister. Is he making fun of me?
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