I would agree that the working conditions, and expectations, in research labs are very difficult for women, especially those with caring responsibilities for children or older relatives..
The same is, of course, true for a vast number of other professions and companies.
But the worst that can be said of individuals who work within those industry / company norms is that they have failed to take a stand to challenge them. The fact that an individual academic, or an individual manager within a large company, follows the organisational or company norms does not make them ACTIVELY sexist. It is just that they fail to be actively more supportive / campaigning against sexism than the rest of the organisation would be.
As I say, when i worked near Tim, he was very much LESS sexist than my female supervisor, and in general more supportive of women than the (then) organisational norms. He did not actively campaign for a better deal for women in science, at least in my time, but he did not in any way harm the progress or prospects of the women around him (was in contrast actively supportive to them as individual scientists), unlike some of his female peers, and treated individual scientists such as myself as colleagues on exactly equal footing to male students in the labs.