One of the commonly misunderstood Scrum Events for new adopters of Scrum. People prone to use this session to vent (which sometimes resulting in that particular person lashing out against other team members) which is not only counterproductive but also accumulating into toxic work environment.
This session actually need you to be more analytical of your mistake, suck it up and create actions to make next try better.
Don’t waste your time doing Sprint Retrospective if you don’t get any action strategy or items.