I don't think Disney should give up on representation and inclusivity just because some people can't accept it. They need to keep forging ahead, get through the rough patches that will surely come and one day (not too far I hope) this will mostly be behind us except for a vocal minority. Things will change, future generations will make that happen, but it just won't be right away. It's the path they chose to go on and I think they should stay with it. People need to get used to seeing all kinds of people in movies, tv, commercials, life, not just who they are comfortable with.
No societal change was every easy.
One day people won't think "hey they stuck a lesbian couple in this movie for no reason" but rather it will just be another couple in a movie...for no reason.
They can finesse how they do it, of course, but that too takes time. I think if the movie is ultimately just good writing, people will see it.