Hexproof only works against TARGETED spells and abilities (and not even against those of the opponent has Nowhere to Run out). Targets are identified by one thing only: the spell/ability using the word "target" to denote them. Being affected does not make something a target, only the word "target" does. "You" is not a target, "each" is not a target, "all" is not a target.

115.10. Spells and abilities can affect objects and players they don’t target. In general, those objects and
players aren’t chosen until the spell or ability resolves. See rule 608, “Resolving Spells and
Abilities.”

115.10a Just because an object or player is being affected by a spell or ability doesn’t make that
object or player a target of that spell or ability. Unless that object or player is identified by the
word “target” in the text of that spell or ability, or the rule for that keyword ability, it’s not a
target.

115.10b In particular, the word “you” in an object’s text doesn’t indicate a target.