Yeah I don’t think OP is referring to the other band members; but Matty has definitely had questionable moments. There does not seem to be any incidents of him mistreating women directly; but he has made some odd comments.

OP is probably referring to an incident a few years back (Pre-Calvin); where it was rumored that Taylor Swift and Matty Healy were hooking up. When asked about his rumored hookup with Taylor; he stated something along the lines of “I wouldn’t want to be referred to as Taylor Swifts boyfriend. It would be emasculating.”

Since then, I think he’s gone onto “clarify” the comments and I remember seeing photos of Taylor and Matty together semi-recently (like from 2019-early 2020) so I don’t think they’re on bad terms, but that’s the incident I see referred to when people call them sexist.