Being made unwelcome in their own country.
A government who does not view them as belonging in that country, even though they were born there.
Being viewed as linked to a country by religion which the Corbyn Labour party has a clesr agenda against.
One of my friends simply said, "you know this is how it starts?". Some of his family were forced to emigrate from Iraq.
I don't blame them for being nervous. That Palestinian Appreciation Society seemed to be riding a wave of self-righteous anger. Easy to start such passion, less so to control them.