Thanks for the links - I have read some of the jokes which amused me. The difference to me is that they are by Jewish people about Jewish people. Everyone is allowed to poke fun at themselves (although I do still think there can be problems about people doing this). The real difficulty for me is when people make jokes based on negative stereotypes of other races as these can reinforce prejudices and encourage a culture in which people are looked down on/thought less of/treated differently because they are of a different group or race. Just because "everyone" does it doesn't make it OK. I didn't realise that you were Jewish and thus poking fun at yourself. If so,I apologise, but I think you should have stated this on your post. This forum can be read by anyone on the net and jokes can cause offence and upset people.
I work in the NHS where we have a very strong equality and diversity programme, which encourages us to challenge things. This is why I responded to your post rather than just ignored it.
By the way, my name is Gwyn, not Gwen!