This happens in real life in software development frequently enough that thinking back on my career I can mentally replay the XY problem chat log as multiple IRL conversations I've overheard between a senior and junior developer without changing much.
I think it doesn't only stem from OSS communities, but is some sort of innate tendency in the types of people who get into software and IT, which dictates that community culture unchecked can become a contest of derision, one-upsmanship, and as you put it, impressive levels of premeditated jerk-ness. I don't know if it comes from the (apparently) increased levels of antisocial personalities in software, or insecurity, or maybe a more base, primal urge to haze the newcomers unnecessarily.
I think it doesn't only stem from OSS communities, but is some sort of innate tendency in the types of people who get into software and IT, which dictates that community culture unchecked can become a contest of derision, one-upsmanship, and as you put it, impressive levels of premeditated jerk-ness. I don't know if it comes from the (apparently) increased levels of antisocial personalities in software, or insecurity, or maybe a more base, primal urge to haze the newcomers unnecessarily.