As long as you don't disparage a particular genre, it's an entertaining and thought provoking distinction, especially when you get right out on the line. For instance, the episode of Black Mirror "Nosedive" gets right out on that line. There isn't much technology that doesn't already exist, they've just gone a little farther with it in terms of electric cars. Then you could go in the other direction - all fiction is speculative to some extent, so when does it cross the line? I'd say it happens when you need to situate yourself to the rules of a very different world, in a broad sense, but very hard to say...
The Handmaid's Tale feels like science fiction to me, probably because it's in a vague future date. But I'm having trouble thinking of anything technology oriented that would have to exist and doesn't already.