I think my tolerance of science fantasy is getting broader, as I appreciate unexplained things that add richness to SF tales. But that said, I don’t really like it when the extremes of either genre get together in some sort of mash-up (such as dragons on space stations, or witches casting spells on FTL spaceships - yes, James Schmitz I’m looking at you). That just discombobulates me a touch too much. Lightsabers and The Force* now, they’re okay.
Consistency is everything. Most readers can detect inconsistency at a hundred paces, and don't like it...