I do not have that reaction to flossing... in fact, I rather enjoy it... I do, however, have that sort of reaction if my fingernails accidentally move along a paper plate... not the thick, glossy ones, just the regular thin ones. Notebook paper and some other paper products as well. The feel of it freaks me right out for a moment and I get that nails on chalkboard response... I jerk back, get the shivers and go to cover my ears. I feel you on that... just thinking about it gives me the same reaction as well.
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"...don't ask me why it's just the nature of my groove..."