Does a Poem?

"Does a Poem have to Rhyme?"
"Yes sir!" said the man,
so I showed him a poem
with a rhyme at the end
and he said, "Why you fool!
that's no rhyme, not at all!
you can't rhyme 'man' with 'end'!
Why, it's not even close."

Then he walked off askance
as I looked at his back
with a glance of reproach
and a crumpled-up poem
And I smoothed it back out
and I crossed out a part
and I wrote something in
but it's not even close.