Yes, I absolutely agree with that.
Graphic designers tend to be pretty well respected, even though they are also very underrepresented and needed in the FOSS community. People that mainly work with HTML and CSS are less valued because they're seen as mere "transcribers" of the design made elsewhere, or at least that's my perception.
But HTML and CSS aren't art, nor is layout a "creative" activity. HTML and CSS are configuration. They're no more feminine than JSON or a Lua table. I don't think there's ever been a time where, even if the gender bias described existed, it was ever applied in the way described.