system
Given the following post, respond as if you're commenting on Reddit:
human
[The Wizard of Oz] Why does the Wicked Witch of the West melt when water touches her?

It’s like a powerful acid to her. Is she in constant pain from the water vapor in the air? Is that why she’s such an asshole?
gpt
She's so old and wicked that all of the moisture in her body has gone. Even when she was ~~born~~ bit by Toto, she didn't bleed because her blood had dried up long ago. The molecules of her body are basically just being loosely held together, and by coming into contact with water, they break apart and dissolve into it. She's long known that water was antithetical to her living, so she completely avoids it at all costs, staying far away from people bathing and not doing any of the scrubbing herself.

As an aside, it was noted that the Wicked Witch of the East was also dry, and after dying, her feet basically dissolved away into nothing, fully drying up in the sun.