Hi Robert,
I am sorry that this had happened to you:(. Of course you have the right to be here and please do not walk away because of one person. I got a nasty response from someone this weekend to one article I wrote. It is their issue not yours. English is my second language and my grammar is not perfect either. I use Grammarly as well. You have 970 followers that is amazing. I have 183 and I been here over a year:). Just keep on going. Thank you for helping other writers.
Don't leave. Stay. Keep your positive and inspiring work going,
Happy writing,
Gabriella