As usual in discussions, there are those who adpot a very sensible, measured, non sensationalist attitude, backed by a small amount of research into the issue. Then there are those who rush in and jump to conclusions, over-exaggerate, invent and become obsessed with one minor part of the issue particularly if the media uses provocative language in its headlines.
PSHE, as Pamish said, is handled very sensitively and calmly and is designed to encourage children to think for themselves about behaviour boundaries and how to respond in various situations. It isn't pushed into the children's heads with the intention of worrying them or subjecting them to unnecessary detail.
I think it good to give this (not so very) "new" idea a chance for the sake of a more informed generation in a rapidly changing world.
Oh and by the way, Disney has just introduced its first gay character into its remake of Beauty and the Beast. Aren't young children going to watch that with an awareness of what exists quite normally in the world around them too?