Yes, sometimes the outcomes and results of an attempt are not known beforehand. Other times they are obvious or implicit.What this says is that something was really at stake. What's interesting is that this doesn't become apparent until the DM is narrating against the PC, either outright or after a roll. It's obvious to you that narrating humiliation without a roll is bad (I agree), but I'm not as clear why sudden humiliation is okay because you rolled dice? Is a bad rol enough justification to enact humiliation is a situation that was no stakes before the roll?
Also, it appears that stakes are being introduced after the die roll rather than as a preface to the roll. The player has no way to tell that the roll may end up with humiliation because the roll acts as a gate for the DM to narrate consequences however the DM wants, with no previous understanding of the stakes involved.
Start trouble in a bar, might get "thumped" in many sorts ways.
While some folks ascribe to forcing a resolution to be expressed explicitly out of scene meta-stakes agreement barter style, others fo not.
That has little to do with whether or not its randomly resolved.