Don’t worry about 2 negative ratings. I think you could have handled the rating response comments better but it’s fine as is now. Just move on. Do not delete your item because of this. Ratings are a dime a dozen and to be honest, i’ve seen terrible items with horrible ratings still make better sales than items that have great ratings but fail to sell.
Just keep producing items that sell and don’t let a few negative ratings discourage or distract you.
Good luck!