I hate "Mrs." I have to look up every single woman I'm adding to this database to find out what title she goes by, and it's hella annoying.
→[More:] I also hate "Dr.," but at least most people who go by "Dr." are indicated as such even when other people's titles aren't listed.
On the plus side, the list I'm typing from did use "Spouse/Partner" rather than just "Spouse."