Can a writer who is not a native English speaker proofread essays written in English?

Was my first sentence wrong, or did it need correction?

Of course, you will trust. Trust is sometimes blind. A fool like you, who does have no knowledge on/about grammar would rely on trust instead of showing it structurally as I did. If you are any worth of anything - c'on show me how I am wrong. If you cannot then just go away and sleep. If you have shame, you will never come up here to write again, at least againt me.

he was wrong, and non-natives can proofread.

You can't [proofread]. You cannot even write.

You are a super idiot, mate. Here I am not saying that your writing is wrong. We were saying that the person whose writing I proofread, was wrong. God help - you are such a poor reader! What the hell you are talking about so long?

If I understood Gibbrish, I would have responded. Unfortunately, Martian, I neither speak Gibberish or whatever language spoken on Mars.

Anyone who does not understand my proofreading here is surely not educated to write for students.

Now this is something true and same as believing we cannot write in a monkey's language and that no student will want papers written in a language other than what humans speak and understand.

If you have courage, go back to the proofreading that I did.

You are simply supporting the FW and opposing me without explaining.

I am grammartically correct

Do its better not to teach a grandpa how to --ck!

Give it up Amnateeb. The Martian is a lost cause.

Have to run. Feel like throwing up because, at the end of the day, I'm actually defending FW. I think I'm also breaking out in hives.