Except there's no science to back this up. All the scientific articles I've ever seen on the topic of gender and sexuality seem to indicate that the critical period for those attributes develop in the womb and not during childhood.
The most likely reason for such deviations from what conservatives would consider, "normal sexuality" is endocrine-distrupting pollution. The kind that causes amphibians to change their sex, for example.
Ironically, conservatives as a voting bloc will be the first to vote to reduce environmental protections and regulations attempting to reduce this (or any) pollution.
My personal belief is that the exposure/normalization is good because it helps people discover themselves. And I read that comment somewhat differently: exposure to these concepts might be controversial because parents have such different impressions of what is "right", so they might end up accidentally brainwashing their child. It already happens a lot, and people obviously don't want more of it.
We pretend like people don't get turned on by their own hand.