Boy, I love scifi!
I sure do, one of my favorite authors is J Wells. im sure you've heard of him right? 
Science fiction
Yes I love science fiction because it avoids the supernatural, unlike some of the related books of fantasy.
No, tell me more please
Um ok, well back in the day science-fiction stories have usually had a grounding in actual science facts, but nowadays this is only expected of hard science fiction.
Why don't you like the supernatural?
I like the supernatural because its spooky and mysterious, I even have a couple books on it. 
But what is that a problem?
Im not even sure what you mean but usually science fiction itself is very difficult to define, as its pretty much a whole wide range of genres and themes.