I then respond with my rewrite and ask for feedback again.

At least this lets me keep the writing mine, while avoiding blatant errors.

That said, I don't do this often, never when replying on forums like this, only when say writing documentation or similar. English is my second language but people will just have to deal with it for the most part.

If you think you're just a poor writer...well, you won't get better without doing it a lot, will you? Also consider that AI assistance will actively hamper your growth, and that's considered a feature, not a bug (would the AI labs prefer you to depend on their products, or to outgrow them?).

On spelling and grammar, you can't get flagged as AI for using spellcheck. I don't use grammar checking, but I read somewhere that grammar checking algorithms have gotten good now, so that could be something else to look into (as long as it just highlights potential problems and doesn't rewrite your words).