This is really interesting.
Several years ago the same thing was being said about having a black/Asian Disney princess.
I'm sure some people at the time said 'I'm sure that these people exist but should we really be promoting it to our kids?' You only have to look at the furore over the Oscars to see that this racism still exists even now. And dont get me started on misogyny in the film world.
If you took the posts here that disagree and changed the words 'gay' to 'black', 'female', 'disabled' it would look like a post from the 1970s.
The younger we ensure that our kids understand that there are people of different sexes, races, abilities, sexualities, the better.
If they are old enough to know that a man and woman can fall in love and live happily ever after, then they are old enough to know that a woman and a woman or a man or a man can too.
It's not about sex at that age, it's about love and about acceptance of others.
In 20 years we will look back and find it unbelievable that people felt it was to be 'hidden'. Just like we do now with the horrendous racism/sexism of the 1970s.