Why do people reject freely offered help?

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I have been having a protracted discussion on another website with somebody who writes poetry. I have made a few criticisms - constructive ones I might add - and just had them thrown straight back in my face. I find this difficult to understand. The poems in question were good, but could have been a lot better if the poet had paid more attention to the scansion and rhythm of his lines. It would have been so easy to recast some of the lines and produce something that read more easily. But no! I was instantly accused of trying to impose my own standards on someone else's creativity, and why were my standards better than anyone else's? In fact, all I was trying to do was point out some obvious flaws that could be corrected very easily. Given that the poet had proved in some of his stanzas that he was perfectly capable of writing rhythmic lines, it struck me as very odd that he also chose to write unrhythmic ones and did not appreciate the difference. Why do people do this? Why write poetry on a public website that is clearly going to be open to criticism and then object when the criticisms are made? If you can write something that's good, why choose to write something bad? As I say, I find this attitude very difficult to understand!