If 5 people say they like or even love your poem - even pointing out favorite parts - and one person points out what could be improved on, does that mean the other 5 were wrong or unknowledgeable?
Is the meaning behind a poem and how the poet expresses themselves more important than someone pointing out ways a line can run smoother?
Firstly, it depends on what the suggested improvement was, e.g. - misspelling, grammar error, incorrect syntax, etc. In that case neither would be wrong. Furthermore, if a poet is requesting honest critique, which in essence is a personal opinion ( outside of proper spelling , grammer, et al ( unless intentional for purposes of dialect ) ), then I don't think it's a matter of who is right or wrong. It's easy to overlook a misspelled word or grammar error if you're caught up in the emotional aspect. Or, perhaps just had a long day and are a bit tired. I've missed plenty myself!
Secondly, again, I don't think it's either/or - but both are equally important. If the poet is only seeking emotional feedback, then they most likely would request friendly feedback. The poet is in charge of the comments by virtue of his choice of which kind ( including none ) he desires to receive, not the commenters. The commenters are merely honoring the poet's request. That in no uncertain terms can be labeled wrong.