Should this be said to a 12 year old girl? (Whoa, long!)

My daughter is 12.5 years old.  She is going into the seventh grade.  She is 5 feet tall and weighs 75 pounds.  She is slight but eats well (she eats anything that is put on the table for her at meals - she may not like it but she does not refuse to eat what she doesn't like) and is active.  She is the definition of awkward - physically and emotionally these days.  

I may be prickly about this topic (food/weight issues, and the words we use about them) and I truly wonder how it gets handled in other people's experiences.  She had an appointment with a doctor who is not her regular pediatrician.  We took the appointment with another pediatrician in the practice because she just needed a booster shot before school.  

Background - I struggled with an eating disorder when I was younger and throughout college.  I really work to have a good relationship with food and fitness. Food and weight are tough topics for me.   

Her doctor came into the room and started going over her information from the MA - "Her blood pressure is normal, her eyesight is normal, she is a very tiny person."  Those were the words he used.  I kind of thought that was a strange thing to say but just let it roll off because I know I'm sensitive to the words people use.  Then he goes over her height and weight percentiles and her BMI - all within normal (although weight and BMI were at the very low end) range.  He then tells her she is "very skinny and needs to eat more".  Just like that.  He then tells us about the booster shot, and ends by repeating "she is very skinny and should be eating more.  She gets this from you, yes?".   WTH?  (He had a heavy germanish accent).

I think the word skinny is unacceptable from a medical professional - in front of a 12 year old girl at a really body conscious time (puberty).  And that was his recommendation?  Eat more.  That's all he said.  He didn't ask how much or what kinds of foods she's currently eating.  He doesn't know that she eats exactly what we do at dinner and helps herself to snacks.  He didn't have any suggestions.  That was it.  

Is that a normal way for a pediatrician to approach this?  I felt like writing him a letter.  But even writing this feels stupid, like I didn't explain it well enough.  Touchy, like I said.  What do you think?