there’s the few who insist on ruining a good thing.
There always is. You find them in every aspect of life. IF it's deliberate, we used to call them "spoilers", today we have a slew of words more specific for internet use...
Sometimes tis simple lack of reading and following directions. Why do people post pictures of their rifles (alone) in handgun threads??
sometimes its just a well meant but misguided answer. Like someone says "I'm looking for a .30-30" and gets told "buy a .308"...
Sometimes its willful disruption. Had a fellow on here a while back who's response in every thread category was "get a Glock!". Pistol, rifle, shotgun, hunting. reloading, no matter the subject or question his response was always "get a Glock" That fellow isn't around anymore. For cause.
Sometimes its done just to stir things up. Some people do it just so they can sit back and enjoy the drama. Mostly answers that don't apply are meant to be helpful, but there are a certain percentage of jerks.
Go looking on forums (any subject) that aren't as well moderated as TFL. In those places its rare to go a dozen responses to anything without someone responding rudely, and often offensively. Personal attacks are common enough they seem to be the norm some places.
If someone is way out of line, report it. Bad actors get the boot here.