Understand that- and the bad feelings in Wales re second homes, etc - same happens here in the Alps where the locals can't afford to live anymore and neither can the workers in the Tourims industry, who all have to commute up from the Valley where rentals are much cheaper. Many of the touristy valleys in Switzerland still have their own dialects, and if locals want to speak about private things, or make derogatory comments about the tourists (be they Swiss, British or whatever) they will switch to dialect and make it very clear- and laugh loudly- happens all over the world, truly, We go to non touristy Tuscany every year, and they will speak dialect if they don't want to make a point- and same happens in Sicily too- as said, all over the world.
People who live in touristy areas often have a 'love/hate' relationship with the tourists. Yes, they need them- but yes, they hate them too- for their wads or cash, luxury châlets/appartments which are empty most of the year, mostly their superrior arrogance and so much more.