filtering objectionable content actually requires you to build a strong AI model capable of being offended itself, so it knows to hold its tongue in mixed company

edit: lest i leave this comment totally useless, the chatbot engine “chatscript” has pretty good capabilities for disambiguating word meaning and classifying the meanings into “badword” and “verybadword” - its free/libre software and very high performance.

https://github.com/ChatScript/ChatScript/