How to better start leaving messages for female students? I used my initials, and a woman told me it was impolite. How should I start? Just type each other's names?

You can be a little funny! Just like watching a play: "Oh, dear-name-classmate, sorry to bother you again!" " ……"

Or you can add the word classmate after their full names! For example, "Hello, Wang Xiaohong! ..... "This is straightforward, but at least it can't be wrong.

Or, you can add some prefixes to describe those female classmates who are more lively or familiar to you. "Lovely, kind and generous Wang Xiaohong classmate ..."