So the difference between this and protests that prevent a new mosque from moving into predominantly non-Muslim areas is what, exactly?
And let's note there were, in fact, actual threats here, not just a boycott, and the fact that the owner of the restaurant is a Lebanese-American. Nice job in harming him and the potential employees he would have hired.
Frankly, one of the few ways to move forward is for all parties to the conflict to begin to recognise their common humanity through trade. This sort of stuff does not help.
I will always defend the right to boycott, but it's often a really bad idea, especially in contexts where trade can overcome prejudice. And too often, calls for boycotts become threats of violence, which are, of course, not acceptable.