There are, of course, gay Catholics, believe it or not. Quite how they can believe all that the Catholic Church tells them to believe – which they must do to be true Catholics – while being gay and believing it's OK to be gay makes the mind boggle somewhat. But there you go. There's no accounting for some religionists.
Anyway, they're planning to "greet" him in Washington and New York, as can be seen in this story.
No good will come of it, of course – except to show a presence to those watching on TV or reading the newspapers, if the protests get much coverage. But Ratzo will not be moved. He'll continue to say he loves the sinner but hates the sin.