bienvenido a espana.
It is good to read how important it is as an immigrant to accept the rules and customs of the country you have chosen to live in.I hope sincerely that those who think like that also practice what they preach.when you choose Spain as the country to live in,the least you can do is learn the language
(I can just see the reaction of an englishman in England when a foreigner p.e. from Mali starts shouting to him in the man's native language and waving his arms etc.he probably would think it was a lunatic trying to talk to him)
Apart from that having chosen this country one accepts its customs as well and when in Rome do as the Romans.
Maybe something tothink about before criticizing others.

Just food for thought.