It just came across to everyone else as a bit harsh. Constructive criticism is one thing, but he seemed to get a little upset by the use of the word "worthless" and the world "useless" when pertaining to his character's traits. I could understand being upset when something you've created and worked on is called those names, regardless of if it is flawed or not.

No one is attacking you or anyone else, but his character was pretty much torn apart, without him explaining at all, and I (and apparently others) found it slightly unfair.