It is not a matter of Christians WANTING to view something as a sin, it is a matter of what God has said is sin - regardless of how we want to view it.
He is right, however, in pointing out some common, overlooked sins in the Christian community - but my sin does not make your sin acceptable, which is the argument he is using.
It is one thing to encourage acceptance of the sinner, a completely different thing to advocate accepting the sin.
Do not take his words out of context. You neatly avoid his other condemnations of those that sin. You look at the mote in his eye while ignoring your own stick