Why so difficult?

I like scifi. I like scifi because it's awesome. Therefore because scifi is so very awesome, other people must like it too, right?
When I encounter another human being my question is not: Does this person like scifi? My question is: Why wouldn't they like scifi?
And I know that there are people who don't like scifi and don't get why I do like it anymore than I get why they don't, but still, wouldn't your default assumption occur along the lines of wanting other people to like what you like?
So when fellow white fen randomly decide that People of Color don't like scifi, I find myself boggling. Why wouldn't PoC like scifi? Scifi is awesome.

So yeah, newsflash, fandom is just as diverse as the rest of humanity.
*headdesk*