It's interesting how you phrase all this. You describe monstrosity with the bee-eating spider, yet you don't point at the spider as a monster. Then, you talk about 'creatures of the dark', and that hints on monsters, yet your description isn't monstrous at all.
I think it was either Canguilhem or Focault who wrote something about monsters and monstrosity as separate concept, only that was on a different note I think... I can't recall and can't seem to find it online either :(. Nonetheless, I think what you wrote here is a great example of that differentiation.
I really liked the phrase from the scene! It somehow points to that relativity @waphilip wrote about as well as to your Shakespeare quote. Also, it rises the question... do we create our monsters? Or do we just choose them?
Thanks a lot for reading and sharing your thoughts :)