yeshivaguy: There should be nothing inherently wrong with it. But you won’t find Kosher L’Pesach peanut butter with a Hashgacha so it’s a moot point. I would buy peanut butter with an OU Kitniyos for myself in a second.
Rebdoniel: We get it already. You think Ashkenazim are foolish backwards people who are Apikorsim because we deny Chazal like Tosfos did. Why don’t you choose to be Jewish first? Then you can become a Sephardi.