Lady Trinity

Here's a little poem from my childhood that somehow crystallises some of today's more unfortunate attitudes. I would be interested to hear if any of you have heard it before and if anyone knows of it's origins.  My father taught it to me and I have never heard it anywhere else.

Across the open moorland, the rain was falling fast,
and through the dripping heather, a Goblin hurried past.
His eyes were small and cunning, his hair was very red,
and he had a green umbrella which he held above his head.

"Oh please will you allow me?" a tiny fairy cried,
"To share your green umbrella by keeping at your side?"
"GOOD GRACIOUS!" said the Goblin, "cannot you plainly see,
that under my umbrella, there's only room for ME!"