One of my co-workers gave me a very candid feedback on my grammar. She said I speak well but I do not write well (sounds like most Caucasians). I was very hurt by her remark but I know she meant well.

She told me that to be a good communicator, I need to articulate and write well. That is true. My boss agreed as well.

She is an English major and I am sure it irks her to see incorrect grammar. I would not be able to stand it as well.

What's the next course of action? Get a tutor. My other co-worker is also a English major and I have asked them to tutor me. She laughed at me. She agreed to help when I need help.

I think it is good to listen to feedback and evaluate what needs to be done. On a positive note, this problem can be resolved, better sooner than later.