People focus on Katy Perry as representative of the whole stunt, because she has been portrayed as the main figure all along.

Pop star Katy Perry and five other women safely returned to Earth after reaching space aboard Jeff Bezos's Blue Origin rocket. - BBC article immediately after the flight

They literally pulled a Katy Perry et al. Do you think that framing just happened without any input from KP and her publicists? Did Katy Perry use her ample airtime to credit all the female engineers that actually worked for years made the flight happen, or to correct notions about the flight not actually accomplishing any significant firsts? Katy Perry gladly took the center of the media spotlight, so naturally people use her image as emblematic when ridiculing the stunt. She is a vapid celebrity doing annoying celebrity messaging like "making space and science glam."

"This is all for the benefit of Earth," she added.

Katy Perry is an eager participant in the outrageous messaging around the flight. She earned the ridicule, not by being a woman, but by acting ridiculously.