Unpopular social norms in science fiction (semi-serious question)

Help!

One of the principle aspects of scifi is asking "What if?"

But what if the "what if?" is freaking people out?

As a mild example, what if a future society returned to earlier attitudes about marriage? Yes, one wants and expects a married couple will be happy together, but marriage isn't really about romantic love. Marriage is about finding a partner you can manage a household and raise children with, and about status and property, and about mutual respect and friendship. So it is completely reasonable to people living in a future society that you might have matchmakers doing the heavy lifting of finding a potential spouse before a couple agrees to gets married, people marrying second or third cousins (it's the future and genetic screening and gene therapy are cheaper than milk), marriages that would have seemed totally normal to Jane Austen (e.g., a 37-year-old man marries a 21-year-old woman), etc.

Every time I have suggested something like this, people lose their minds. Words like "creeper" and "pedophile" get tossed around, sometimes in my direction. It is a little unsettling.

Any advice for how to gently explain radically different social norms to people?

Or would I be better off just writing my stories and not worrying about the opinions of idiots? Except the idiots will be writing book reviews on Amazon. (But then, that would be true in any other writing experience, wouldn't it?)

Thank you in advance.

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