I'm super human by all honest measures, but management without fail starts giving me guff about going to the gym and having lunches away from my desk. I can venture into justifying that I don't use social or anything on the clock which creates clear head space, etc etc, but it'd fall on deaf ears... I'm old school like that.
But the calendar creates an attack surface. I don't want to work at such companies, it's not always been that way, but it's been consistent across shit rung startups.
Management wants me at my desk 12 hours a day and always on call, and makes "jokes" about anything that I mark as time I want away from my desk. Often 2 hours discussions start 15 minutes before I have an outside event noted.
I quit these jobs when the abuse threshold is crossed, but the departments are made up of mostly people on visas etc so they're not so lucky. It should never strike management as a surprise when I leave, but I get the impression they're used to dishing out abuse to "non-compliant" programmers. The bros thrive, the meek get beat down and go home to lonely apartments full of cats where they passionately code themselves to sleep with Netflix.