I'm not discounting her founder status. My point is that it's orthogonal to one's ability to run a company. Founders don't automatically make good CEOs. Plenty of founders step aside for professional management, and plenty stay on and struggle.
Questioning whether someone was the right fit for a role isn't an attack on their legitimacy or their earlier contributions, no matter how pivotal they were. Steve Ballmer at Microsoft had a quasi-founder status, and he received the exact same backlash and hate throughout his tenure because he was perceived as someone who "didn't get it".
If the argument is that any skepticism of a female CEO's performance must be sexist, that shuts down legitimate discussion. I'd rather focus on outcomes rather than on trying to divine each other's motives.
Lastly, Your "pause and do better" is exactly what I'm objecting to: framing disagreement as moral failure. Question Baker? Sexist. Disagree with me? You're not doing enough for the cause.