He has previously describe gay marriage as the work of Satan, so it's hard to see why people are surprised/dissapointed by this. A terrible view of course (and probably very offensive to the countless homosexuals who have fought for equal rights), but one that is to be totally expected from the Catholic Church.
The surprising thing is not that he has that view, but that he emphatized it so relatively strongly. It seemed he was trying to tone down the anti-gay sentiment and lay low on the gay marriage issue.
Being in the Phillippines may have influenced his choice of words, but they obviously knew that Western media would pick up on this. While the Catholic church has strongly felt theolgically based opinions on this they also know it is a losing issue in the West (and parts of Latin America) and there is a political dimension to the issue as well.