It the reason some of us dislike Davis Cup. Does not provide the best conditions for tennis of the highest quality.
That´s not always true.
Hope Safin does not have to play Blake in New York or Nadal in Madrid.
I didn´t watch this tie, but I doubt playing in Madrid or NY is worst than playing in Chile, Argentina or Brazil. It´s probably the same in some occasions.
Anyway, it´s DC, players who doesn´t play at home complain about the crowd, the crowd tries to make them 'suffer' during their time on-court , nothing strange there.