Tobin should welcome everyone to the cathedral who is baptised or wants to be baptised in the death and resurrection of Christ. And that is the only reason anyone and everyone should be and must be welcomed. 

The dying to oneself and rising with Christ to a new life, has no qualifiers attached to it, such as male or female, Jew or gentile, gay or straight, black or white or polka dot. 

There is no such thing as "I am white, who happens to be a Christian," I am a gay who happens to be a Christian. He did not (does not need to) welcome  the "heterosexual community" or the "female community" or many other communities either. So, what's the point in "welcoming the LGBT community"?

I guess the Pauline maxim of "no male or female, Jew or gentile" has limits after all.... when it serves someone political and ideological purpose ...