While I agree with you wholeheartedly, Dear Abby isn't about tolerance. It's about seeking advice for a particular situation. Not everyone is going to agree with our lifestyle. That's ok.
This person has a small mind and will NOT open up to any other possibilities. She's made it clear that she doesn't approve and doesn't want her children to be around that. That's her choice to make. It's up to us to show those kids down the road that just because you don't fall into what society deems normal, doesn't mean you're a bad person.
Live life to the fullest 'cause you never know if you're gonna wake up tomorrow!