Kicking people from your tech conference because they were racist outside of it hands veto power to whoever determines what racism is and when something is 'too racist'. The same goes for the other beyond-the-pale isms like sexism, fascism, etc. I commented on a flagged post on why this is an issue for me personally: https://news.ycombinator.com/item?id=9674958
It saddens me that you're making this obviously fallacious argument, because your reasoning is so transparent. You're a Zionist, who has sworn allegience to a genocidal government. As a supporter of genocide, you are concerned that someday you'll face consequences for your decision to materially support mass murder.
So, you're trying to criminalize, and shame the idea that anything is ever wrong... because some part of you knows that what you're doing is one of the worst things in all of human history.
That's also why you make up phrases like 'Progressive Except Palestine', to attack those who oppose the genocide that you so love.