Oofta
Legend
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.
If you count a super atomic nova wedgie that has absolutely no long or short term ramifications other than a story to tell ... well then anything a PC does could be considered as having ramifications.
It's also true I didn't tell the player exactly what would happen. If their PC doesn't know, they don't know. I don't see why that would be an issue instead of simply being a different style.
You know what? Don't want to play this way? Don't. I've gotten a lot of praise for my DMing style and the games I've run over the years, I'm just relaying what works for me to people that might be interested.