Catalan is interesting. Officially it's a European minority language, yet it has more speakers than Danish, an official majority EU language. Why shouldn't Castillian Spanish speakers pronounce Barcelona with with a dental fricative. Afterall anglophones pronounce Paris with an /s/ at the end. Saying Barcelona with a lisp is no more pretentious than saying /pa'Ri/. The CSp and Catalan pronuciations also differ in vowel quality: /,barTe'lona/ ~ /,bars@'lon@/. BTW, I always thought the rule for {s} > [T] was mirrored in the orthography. Only an /s/ in non-Castillian Spanish that is written {c} or {z} is lisped.