Standups are mental health minefields. They are a hack evolution of an educational process best left out of the workplace. Law/med schools employ such tactics to deliberately create stress. That has a place in education, but to see it continue at a location where people work year after year is disturbing.
Startups that use standups also often miss the physicality of what they ask. They do not realize that they are disadvantaging people based on totally irrelevant criteria. There is a reason that, throughout history, people have sat down together to discuss important matters. Sitting is an equalizer. Sitting removes the threat of immediate physical violence. Save the standup confrontation junk for the courtrooms.