Relax,
The hospitalero did the right thing, IMHO:
Placing your backpack on your bed means exposing your bed to all what your backpack has been through, into a new and clean bed: Not good. And he/she was probably very tired of unknowing pilgrims doing this. But you'll learn along the way.
Remember also, the hospitaleros are many times volunteers. They are there because they are devoted to helping pilgrims. As for newbies, they often need help. This newbie got help in a rough way, and it will be remembered.
To get it through, I will tell you a story:
On an autumn day, a little sparrow suddenly understood that he had forgotten to fly south for the winter, when it started to snow.
He took off, but as he reached height, it got so cold that his wings froze, and he fell to the ground.
As he laid deep frozen in a farmer's field, shivering, the farmer came plowing the field with his horse,
and as they passed, the horse left his droppings onto the sparrow.
The sparrow was becoming warm and comforfortable again from the heat of the shit, but then started to think: "I am covered in shit! I cannot stay like this!"
So the sparrow started to squeek and make all kinds of noises to call for help, and finally, the cat on the farm heard him, and came to assistance.
The cat cleaned the sparrow thoroughly, and then ate him.
The moral of the story:
The one who shits on you is not neccessarily your enemy.
The one who gets you out of the shit is not neccessarily your friend.
Finally, If you are warm and happy in a pile of shit; keep your mouth shut.
Do appreciate the albergues and the hospitaleros: They are there for you and your needs. If you need more, book a hotel for the night: I sometimes do...
PS: That being said: In 7 years of walking, I have never seen a bed bug, and I have never seen a person bothered by it. You are overreacting regarding bedbugs.