I think you see this in all the ki-masters and phonies in TMAs. People like George Dillman who were arrogant enough to believe that he could trick people with his ki-magic BS, or simply believed he could actually do stuff like that is the height of arrogance. You also see it with the cult-like behavior that you see within some TMA circles. Rokas discussed that quite a bit in one of his videos.
Speaking of Rokas, he also talked about how he expected to be laughed at and taunted by the MMA community after he got embarrassed in that Aikido vs MMA video, but he was surprised at how many in that community applauded him and respected him for stepping to the plate and putting his art to the test. On the other hand, he said he was largely attacked and derided by the Aikido community at large who thought he was an idiot for using Aikido in a MMA sparring test. I will say that outside of some very rare instances, the Bjj community is one of the nicest and welcoming martial art communities I've ever experienced. There's a real down to earth feel to it, starting from calling your instructor by their first name, and everyone's actual skill being laid out in the open for all to see.
It's rather easy to smash egos in Bjj when you're a big burly wrestler getting submitted by a skinny teenager. The "mind and spirit" then enters the equation, and you wonder if you want to continue getting your ego smashed by continuing training, or if you want to pack up your ego and leave. Many choose the latter.