This did happen at work but I can see it happening anywhere, so I put it in this folder.
There is a gentleman, I'll call him Bernie, training with me who once worked in this field and has now returned. It has been long enough since he last worked in this field that he has to attend basic training again. I don't know how long he worked in the field, but it was long enough for him to obtain a good chunk of experience. It seems, because of this, he thinks he needs to let the rest of the class know how much he knows. Honestly, I will say, he doesn't do it all that often, but when he does, it's obvious what he's trying to do.
Today, our instructor mentioned N.E.W.T.* two or three times in the course of 1-2 minutes. It was easy enough from context to figure out what he meant though I can see where it wouldn't necessarily be obvious. Bernie raised his hand and when the instructor acknowledged him, he said, "You might explain what N.E.W.T. means." Those were his exact words, and he gestured around to the rest of the class.
I was immediately taken aback by his tone and the way he presumed to tell the instructor what he might do. Honestly, I felt it quite rude, but the instructor didn't miss a beat.
Bernie did it again about an hour later, using the exact same phrasing and gesturing. "You might explain what a tent* is."
Does anyone else find this rude and presumptive?
ETA: *Not actual terms.