I have for quite some time been part of the sheep mentality to crypto (being new to this space), but finally have found the benefit of doing my own research. In fact for the first time this has shown in the (slow) growth of the value of my portfolio.
However I have certainly found that in forums certainly individuals match precisely the definition you provide. To someone like me, this is perceived as arrogance and I have to resist the urge to go back to old posts and point this out when their decisions/advice has been shown to be flawed or totally wrong.
This certainly is even more true in the crypto world where in the short term, peoples emotions seem to dictate price as opposed to well thought out technical analysis (this of course is a generalization).