Nobody ever assumes I'm Jewish in my experience. I don't have several of the "assumed" traits physically, and my name is an Ellis Island Special, so people only realize when I tell them. Which typically comes up when I'm trying to schedule vacation time at work, or during the Xmas season when people ask what I'm doing.

I can't say I've personally experienced any prejudice for my religion. There were anti-Semites where I grew up, but it tended to appear in a more general sense--graffiti and the like--then as anything personal. Unless you count the one or two born-agains who worked for my Mom and kept trying to convert her, but that's beside the point.

However, I've experienced a lot of biphobia, both direct and indirect, and almost always worse from gay men and lesbians than from straights.