The above, but with the following changes:
Thorn Whip has you make a Melee Spell Attack; if you have a hostile creature within 5 feet of you, you will have disadvantage, as with any melee attack. The actual reach of the spell or feature is irrelevant, as is its target.
The crossed out section applies to
Ranged Attacks (from a weapon or a spell), not Melee. I assume you just had a brain fart (or alternatively, I'm wrong and having one now).
