A society that can laugh at itself is an homogenous society where citizens share the same values. Today unfortunately that's not the case anymore.
This is not a racism problem (the UK historically had a lot of well-integrated immigration in the previous centuries), but about minorities that don't want to be integrated and want to impose their culture (look at Sharia tribunals in the UK) - and criminals from poorer countries abusing the EU freedom to travel, the welfare state and how lax the police is.
The UK is not the only society to have been destroyed in the name of globalisation, but it's certainly a sad state of affair.