In the first place what I call “the gay thing” is something which has just happened, and is just happening, to all of us, whatever our own sexual orientation is. You can be as straight as you like, but being straight is no longer the same as it was when there was no such thing as “gay”. Our picture of what it is to be male or female has undergone, and is undergoing, huge changes which affect us not only from without, but from within. We find ourselves relating, whether we want to or not, with each other, and with ourselves, in new ways as a result of something which is far bigger than any of us and which is just happening.
Now please note that none of this makes any claim about whether this change is good or not, nor does it make any claim about what, if anything we should do about it. It merely notes that it has happened and is happening to all of us, Catholics and non-Catholics alike.