I think this could be a good teaching tool for why some words or phrases are offensive.

For example, I personally don't find the word sucker or the poop emoji offensive enough to get flagged. Maybe I'm missing context? With this tool, I don't get a chance to learn about my inappropriate words/emojis.

Also another feature I would like to see are suggestions on what phrase or word is better.

For example, when talking about blacklists and whitelists, you could suggest using the words denylist and allowlist as alternatives. Or when you write "the food tastes like (poop emoji)" it could suggest, "I disagree with the taste of the food".

nit: you mentioned you built this tool in a month but the copyright reads "2020-2022".