Not acceptable in a family environment. There is a time and a place.
Well done to the shopping centre in dealing with this so smoothly:
"A spokesperson for the London shopping centre said: “Westfield London and Westfield Stratford City are busy family-centric destinations and to ensure a safe and inclusive environment for all our visitors, we do not facilitate protests within our centres."
https://www.thejc.com/news/uk/protesters-drape-westfield-stratford-in-colossal-palestinian-flag-lw9ma1jo