Hi,
No offence please but that is a clear sign he is not matured (at least not matured enough). The word "divorce" shouldn't be used at all (unless it's real time to divorce). You should discuss that issue with him. Above all you should define what are the limits you won't cross when you argue (e.g: Not to mention the word "divorce", not to use bad language, to exclude certain words from your vocabulary..... etc)....
Life is getting tough, even to argue there are rules..... lol....
Best regards,