Is there a well known myth you don't like?
By well known myth, I mean a myth that every "surface-level" so called myth fan knows, after reading Hesiod, Homer or Ovid, or just Wikipedia pages and Theoi referencing these authors. Not something you can find only in some scholia, Servius' commentary, Vatican Mythographers etc.
Personally I don't like Hephaestus being son of Hera alone, I prefer him being son of Hera and Zeus. Also, Ovid's backstory for Medusa. Not because it's "actually just Roman", but because it was overdone by popculture, and spawned weird, pseudo-feminist hate on Athena