Do you use this expression in english? "speak for yourself"
A: You know. Just because we have plain faces, that doesn't mean we could't get a girlfriend.

B: Speak for yourself! I have a girlfriend.

The explanation that I want to say is something like "don't talk about things you don't know" ot something like it.

Thank you in advance!

Question

Do you use this expression in english? "speak for yourself"
A: You know. Just because we have plain faces, that doesn't mean we could't get a girlfriend. 

B: Speak for yourself! I have a girlfriend. 

The explanation that I want to say is something like "don't talk about things you don't know" ot something like it. 

Thank you in advance!

Answer

Yes, we use this, basically person B is telling person A that he should only say that about himself, and not person B, so person B should 'speak for himself' only and not for person B, since what he is saying does not apply to person B.
I hope that made sense :)

Answer

Yes I do!

Answer

Yes, we use it!  To me, the idea is that B tells A that A's general comment doesn't include B (or anyone else really... only A).  It's like saying, "well that may be true for you, but it certainly doesn't apply to me!"