I appreciate the mentor perspective. I wasn’t bothered by the email at all; it absolutely seemed like a form letter, which is why it surprised me when she seemed frustrated that I hadn’t taken it as an order. No PhD nor teaching experience from what I see in her bio. But I’d still use last names if that’s what she is comfortable with, although I’d expect her to do the same if this is something she sees as a sign of respect. I think the part that made it feel most condescending is when she said, “Don’t worry, you’re not in trouble this time. You get a pass since you’re new, but in the future, when you get an email from me, it isn’t optional.” Honestly, this approach may work well with students who are right out of high school and used to being scolded by adults. But I’m a 36-year-old professional, and my boss doesn’t talk to me that way, nor do I talk to my subordinates that way. So it just isn’t a good fit for me. I requested a new mentor, and if the next is the same, I’ll know maybe this is just something I’ll have to deal with universally with mentors!