I believe that Rick's criticism of Spain's Costa del Sol is not of the people who choose to live there, it's more about the experience of being there from the standpoint of someone who goes expecting to "experience Spain."
I think it's a fair point to highlight that this is not a good place to really experience Spanish culture or Spanish life, and that most tourists visiting there would find their experience to be an odd feeling of being in the UK, surrounded by English-speakers, English culture, English Food, English media, all the shop signs in English, etc., and all that appears to have been transplanted to the shores of Spain. There's nothing inherently "wrong" with it, it's just not what most foreign visitors would seek out in Spain. It's understandable that makes for a pleasant experience for those from the UK who enjoy their familiar pubs, breakfast, etc.
Tastes vary, but personally, I generally don't get a favorable impression of foreign enclaves wherever they are, whether that's Brits in Spain, Americans in Mexico, French in Morocco, Aussies in Bali, or wherever. But I can certainly understand the appeal of those places for those who want to be in a warm overseas location but still have the comforts and familiar amenities from home.
I don't think it's a knock against anyone, so I wouldn't take it personally.