Friends with Good Intentions?

H • BLM // Click the link in my bio to learn more about what you can do to help
(For those unaware) on Instagram, many people have "finstas" or fake instagram, which is essentially an unfiltered account where you can post whatever you want because unlike your actual instagram, this "finsta" is for your close friends only.
With that out of the way, I have a friend who has a finsta. Before spring break, she started a diet. Every week she would post updates of her progress with pictures. 
In all of her pictures, she was noticeably sucking in her stomach/holding her breath (which I think a lot of people do instinctually when they're exposed but regardless), these were in the comments section.
Now keep in mind this is an account that only her close friends have access to. 
**QUESTION FOR THE POLL**
How do you feel about friends giving their honest opinion with good intentions? 
Additionally, was this specific instance taken too far by the red user?
And furthermore, what is "too far" when it comes to being honest & trying to help friends?

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