It's different because Islam is a relatively hidden and unknown religion for many people, especially those living in the US. It's justifiable that an American pop singer wouldn't be educated on not only Islamic culture in general, but also the ins and outs of the Arabic language and what every single letter of the Arabic alphabet means, especially given Katy's background in the Christian religion. On the other hand, gay rights is probably the most discussed human rights issue in the media nowadays, and so there's not really any excuse for someone in the public eye like Juan Pablo to be ignorant about it. His comments about gay people being "perverts" and bad examples for young children were deliberately said in order to hurt and belittle gay people: if he really felt strongly about the issue he could have been more respectful about the situation, but instead he chose words that he knew would be offensive carelessly purely in order to offend gay people. Also, in regards to your comment about "most people" finding it inappropriate to feature gay couples on television shows: fans of some of the biggest tv shows such as Modern Family, Glee, Scandal and Revenge disagree with you.