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It's really hard to hide it when you hate someone that much. Eventually they'll figure it out. Maybe if you feel that strongly you should just speak your mind and save you both a lot of trouble.
I don't discuss my political views at the office. I don't discuss my religion. I don't discuss how I'm raising my kids. I don't discuss anything that could come back to bite me in the ass.
So ideally I would never know his views and he would never know mine.