Your example isn't really that good of one, because that would be obvious if I were black or not. But because people know my name is Jerry, they automatically assume I'm Jewish. So people who don't know me all that well, make that assumption without me ever saying anything about if I am or not, and then start bringing that into conversation, jokes, whatever. Treated or looked upon differently because of it. I don't like that, it's a stupid assumption to make and surprisingly a lot of people make it. I'm already not a fan of religion, especially Judaism. It's just a bunch of voodoo bull**** to me.
As far as the sterotypes of the Jews go, do I think they are right? Like a lot of steretypes, no. But don't include me in them because of a suspect first name.