Ok, this whole situation is hypothetical and in no way reflects on anything I have experienced or anyone I know of. It's just something I started thinking about.. :)
Now let's say a child comes out to his devout Catholic parents that he's gay and he is choosing to live an actively gay lifestyle and he refuses to repent of his sin. Because of this, his parents become absolutely enraged and decide to disown him and cut off all ties with him because he will not repent. The family will not talk to him, has cut him out of their will and will not change until the son decides to repent.
I would think of this situation as reasonable. Sort of like an incurred familial excommunication that the son willed for.
Would that be wrong? It's not like the family hates him and won't forgive him, but they simply want nothing to do with him because his sins bring great shame upon the family and he will not give up on his sins. The family agrees to "reown" (so to speak) him if he repents and comes back to them, but unless that happens then they will not.