“There was a meshugana troll some time ago who has left now, but one of his crazy nonsense was a Halachic piece where he suggested that it was a chumra and that to wear a brim wider than a tefach brim-down was assur on Shabbos.”
The Shulcha Aruch says (301:40) ???? ???? ????? ???? ????? ??? ???? ????? ????? ????? ???? ???? ???
While there may be heteirim, it hardly qualifies as crazy nonsense.