Muggles.

Oh, did Snape ever so hate Muggles. This island represented everything he hated, and this was a prime example of it.

"Usually people who flit about nude do fit into the category of pervert, officer of the law or not," Snape replied drolly. A little smirk started to tug at one corner of his mouth. As horrified and furious as he was over apparently having to room with an exhibitionist, it was a bit satisfying for Snape to know that the man was absolutely flustered.