What does the following sentence mean?

I don't know about you or not.

Bir çeviriye bakın

@DJ_Saidez Thank you for your input. I came across with the sentence at the following URL.

https://hapaeikaiwa.com/2020/09/18/%E7%AC%AC305...

In the article, Christian says "For me, it’s like, if I have you like, as a friend in my head, and we’re already good friends, it doesn’t really matter to the group, I’ll curse. But if you’re like, maybe older, we’re not quite on that friendship level yet, I think I kinda (kind of) hold off a little bit subconsciously on like, which curse words I use. I don’t know about you or not, but that’s how I am."

He is a native speacker and I wonder whey he uses such a grammatically incorrect sentece.

Do you see why with the additional informatio above?

@DJ_Saidez I don't know why Christian used the expression but I will just avoid using the sentence in the same way. Thank you!