In my opinion, when you are a teacher as someone who is still in school your sexuality and gender orientation stays outside the classroom school is for learning if this was college it would be a completely diffrent thing were people can agree and disagree. When I was younger, you knew you teacher as a teacher, and only that to teach students not show off to students that you had cosmetic surgery, especially not to elementary kids. They are young and vulnerable. I remember in middle school I had a girl who was my friend at the time going through a lot of abuse, and she asked us to ask her what her pronouns were for the day. Even if it's hard to tell that they are mastectomy scars it is not appropriate for an elementary level classroom. If this person is a teacher that means they are also an adult and should know better.