Push button operated self-opening toilet doors are the worst. With buttons that do not operate as they lead you to expect them to.
So you go in, and manage to make the door shut itself; everything seems to be OK, so you proceed to business.
So you're happily discussing an important contract, when all of a sudden, for no reason, the door begins to slide open. There isn't anyone outside who's just opened it, it just decided to come open of its own accord in response to some random electronic whim that took its fancy.
And you can't bloody stop it. You mash frantically at the close button, but nothing happens. It ignores all input and just grinds slowly and inexorably all the way to the fully open position. The wide, gaping, disabled-access-compliant fully open position that lays bare all concealment.
Only when the door has completed its full travel, at a pace that would handily win it a slow race for snails, does it finally condescend to take notice of the panicked hammering on its button, and slowly, oh so slowly grinds its way closed again with the same molluscine absence of urgency. And all the while a carriage full of passengers are trying to peek at your commercial secrets.