Someone (not here in italki) make fun of me because I committed wrong grammar. He said something like this grammar makes me want to throw up etc. I think this man is very rude. For sure he cant speak even a single sentence in my native language then he is making fun of my wrong grammar instead of correcting me which would be more helpful.
I am posting this to remind native speakers or professional level of a certain language not to make fun of people who are still learning.
"This grammar makes me want to throw up" (or something like that) is a childish and petty thing to say. It's completely infantile!
The only time I would lace into someone over their grammar is if that person were boasting about their language skills but making horrible mistakes at the same time. Even then, I'd avoid silly hyperbole like "throw up". I see almost all of us here are pretty aware that we're still learning (with only one or two self-congratulating exceptions).
Generally speaking, unless someone is actually asking for help or for corrections, it's rude to point out errors in grammar or pronunciation or spelling.
This person just wanted to be hostile to you. He wanted to hurt you. He chose grammar because he thought you would be vulnerable and that it was a way he could make you feel bad.
He wanted to make you feel bad.
Mean people are everywhere and unfortunately they do have the power to hurt. Sometimes they are very clever at figuring out what is going to hurt.
But, you are right, he was being rude, and he was trying to hurt you.
If he was actually a teacher, then shame on him.
Was it online? Unfortunately when native speakers see someone use less-than-perfect grammar online, we tend to think the person is a very poorly-educated or stupid native speaker rather than a foreigner. A lot of English learners write something like "I'm sorry for my poor English. It's not my native language" at the ends of their posts online and that generally seems to work.
Don't get mad about it, not worth it.
I would also recommend just to ignore these statements. Keep learning, no one is perfect. Do your best regardless of what other are saying. Good luck with it!