This was not the dumbest thing to say at all. For all your extra words, those high frequencies are de facto line of sight. If you live in the mountains anywhere remotely rural you know this is true. Also, the low frequency bands are known for their penetration and diffraction, but even VHF (~150MHz) is considered line of sight due to its low diffraction. On what basis are you so confident? Neither physics or empirical evidence back you up. Pretty high-handed with your, "dumbest thing to say," comment.