I'm staying longer term in BCN for a month and a half and accidentally ended up at an outdoor concert last night before realizing that it was protesting tourists. "Tourism kills the city" was the slogan on the signs around the area. In 2 weeks, I've seen at least 2 demonstrations like this and it seems to be picking up from previous years that I've been here. Things are a little more crowded and I feel like every day…
Catalonia is not only Barcelona. In Barcelona tourism is about third of city's income, so protests like this are ridiculous. Noisy tourists are usually in hotels/hostels. And I have to say locals sometimes are more noisy than tourists.
I think that the debate in Barcelona (and other cities) is a little more sophisticate of what your are implying.
There is a balance somewhere that cities have to find and this is what they are trying to do. Another consideration is that excessive tourism will kill what makes the city interesting.