You could have revised it in a better way but you insisted not to.^

Look, I don't care what you say, you can swear however you want, but there's one thing I will not let you do. And that's discriminating someone. You already knew she was in the process of improving her english. Yet, you throw this comment down and judged her.

You can do anything else, with the exception of doing this rude thing.
I think it's time for you to stop.

Please, due to respect, grow up.