I think the OP does have a valid point and observation. I used to work with Jewish and they are a very closed group (to the point of racism).
Let's all just get real here, guys. Imagine you are white/yellow/black and going to a south Indian group asking for capital and support.
They'd likely:
1), reject you and think you're too upfront or brash
2) just look at what you have to offer. And just base their friendliness to that and that alone. If you are good, really good.... a couple or few of them might give you their cards while the rest watch with a guarded curiosity.
If your idea sucked... perhaps they may even laugh behind your back after you are gone "What the heck was that dude thinking, coming to our circle"!?
Now imagine a south Indian, from the same hometown as them, meeting the same group and greeting them in their home language. Just IMAGINE what would take place after they found out he was here all alone, with nothing but a dream and an idea? They would probably encourage, support and a couple or a few may even work on the idea together. At the most, if his idea really, really sucked, they may still invite him to hang out with them at their next BBQ gathering.
This is life. And you can switch the races and nationalities with any. But the results will be similar. We tend to like people who are similar to ourselves. Let's not pretend this does not exist.
Now that's out of the way:
Don't let that stop you, though. What you think and focus on, you manifest.
So, just FOCUS on your idea and your startup.
Make it the BEST you possibly can, then improve on it some more.
Make it so amazingly good that anyone you pitch to, be he /she black, white, yellow, orange, Jewish, Muslim, Buddhist, Vegan or Vegetarian, will grab hold of you and beg to be your investor and support.
When you have this..... then race is the least of your worries. Focus on what you can do. Not what you cannot change. Don't worry about the 'Jewish thing'. Be your best!