No problem at all with immigrant communities making an effort to keep their identity, language and culture - the difference is when that is opposed to integration, sharing in the culture of where you have chosen to live, learn the language and history - as well as ...
Just too many British expats in communities in France and Spain never make an effort to integrate, learn the language, etc. Many order on line from Tesco's etc, and have stuff delivered regularly from UK, have unregistered plumbers and electricians driving over with white goods, etc, and have the work done on the black and often without following local regs, etc. There are many notable exceptions indeed - and neither side is limited by 'class' either. Many of the ones who behave as above are very well to do ...