Many of the comments I have seen have been spread out over several threads by several people, but I can give a few examples of times where Jews have obviously felt misunderstood and almost seem to be offended because they are being told their culture is something it isn't.
One of these people I've seen in the forums, but would rather not mention his name because I have no asked his permission to do so. I will say though, that even as a Christian Jew, he seemed a bit bothered by some of the comments made.
I don't disagree with Zone's quote of Romans 1:16, because as I made obvious in my original post, I do believe the gospel is for the Jew and the Gentile. If it wasn't, Jesus would not have sent his disciples to the Jews first, then to the Gentiles after His death.
The second person that I know who has been greatly affected by some of the comments about Jews made here in the forums and in the chat both is a friend of mine. We talk spiritual things, and he seemed sincerely interested and studying more on Christianity so he could make a personal decision to if he believed Jesus to be the Messiah. I'm afraid he has probably given up the pursuit of that now, as well as he has left this site due to comments made. I believe him giving up his pursuit was also affected greatly by the way people were reacting and speaking about the Jewish people.
Someone mentioned having seen people who are not Jewish pretending to be Jewish. I have seen that here as well as other places. I assume you mean they say they're Jewish, or a Messianic Jew, but really aren't, but your definition may vary. I believe anyone who is a Christian can call themselves a Jew in the spiritual sense, but there should be a clear line drawn between that and being a physical Jew.
For Jews, being a Jew is more than religion. Being a Jew is there ethnicity, and it is their race. To tell a Jew that they are no longer Jewish because they are a Christian is most often times insulting. It would be like you telling me that I'm no longer American, or that I'm no longer German, Irish, or Native American, becaue I am now a Christian. Sometimes it just helps to understand the Jewish tradition and mindset on things like this. I don't find traditions such as this one to be much different than the various other traditions other cultures around the world have.