If its cultural and not genetic then can I decide that I am Jewish? Can anyone? I would never do so but it seems like that is what you are saying.
Not that there is anything wrong with being Jewish at all. Just want to make that clear.

The first love of my life was a Jewish girl. She was told by her father she couldn’t see me because I wasn’t the correct religion.

Another reason that I am just against religion of any sort. There is always the correct religion when it come to religion isnt there?

:49 min.

"You're not Jewish" = you're not one of us

According to those who defend the sale of Palestinian lands in the West Bank at American synagogues, if you are a Jewish voice for peace who opposes that, you're no longer part of the tribe.

Isn't targeting or isolating Jews based on their political views regarding Israel anti-semitic? Hmmm...

Same with most religions. I side on the secular.

I guess in certain circumstances it wouldn't be.

There is precedent for that in our society to use what would be a derogatory term as a familiar one but this is not the case. This is people using it in a obvious derogatory way. I fail to see how this would be ok and labeling it as anti-Semitic should be easy for any of us.

I could see saying "you're not Jewish" to a person who claims to be Jewish who is not.

That observation is irrelevant.

Is it akin to telling a Christian that they are not a Christian? Because I have done so when their behavior is frequently at odds with the teaching of Christ.