I’m Jewish and living in North America. I have no ability to affect Israeli policy, nor is my heritage an endorsement of it. If someone was yelling at me about Palestine because I am Jewish, I would be pretty offended, even though I probably agree with them.

It’s the same as running up to a Muslim and screaming “stop terrorism”. Or running up to a black person and yelling “stop gang violence”.

The action of yelling at a random person because they belong to an ethnic group that is the dominant party that is doing a bad thing in a different part of the world means you are inherently judging them for their race/ethnicity. It is a pretty good definition of racism.

If you are yelling free Palestine at everyone, fine. If you are targeting your message at people because of their race, that’s just racism. The targeting is the issue, not the message.