This is a really hostile way to approach things, and for a lot of us, that degree of "pay attention" is not physically compatible with how our brains work. Even medicated, I simply can't keep track of things consistently; stuff just sorta slips my mind. Even really obvious stuff. Even stuff I care about.
Luckily for me, I play with adults who are more interested in having fun than showing off how not-disabled they are, and everything works out fine, because if something's obviously inconsistent with what's immediately obvious to my character, the GM or another player will usually prompt me about it.
They are two completely unrelated items, so no I wouldn't expect that would occur nor would I be happy with it.
It certainly sounded to me like the DM intentionally misled the player to take advantage of the fact that the player was distracted.
I think the big thing is, the ring is not "part of the suit of armor", even if you argue that the gauntlets are.
The DM is provider of the information the players need in order to know what their characters are seeing in the world around them - if I give a player some clue (say their is a stopped clock on the wall, but mechanics are still ticking) and they don't do anything with it, and they return to the same room later and I don't give the same clue because their character can see and hear it again, then that clue is no longer in that room because I have caused it to cease to exist - all in the name of "well, I said it once... your fault if you missed it" antagonistic play.
The ring and suit of armor aren't completely unrelated items?
So, I agree that there's a reasonable approach to this sort of thing, and as a DM I'll often remind players of important things they may have forgotten. Part of it is taking into account the players themselves. For example, I don't expect the same things from my 12-year-old daughter as I do somebody who has been playing for 20 years.
It certainly sounded to me like the DM intentionally misled the player to take advantage of the fact that the player was distracted.
I think the big thing is, the ring is not "part of the suit of armor", even if you argue that the gauntlets are.
It certainly sounded to me like the DM intentionally misled the player to take advantage of the fact that the player was distracted.
I think the big thing is, the ring is not "part of the suit of armor", even if you argue that the gauntlets are.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.