I don't perceive Bosky as being unnecessarily aggressive here. My perception is that he suggested BK do her own research by way of library and then when pushed explained that he'd seen a lot of RTAs by way of the dry walls that BK described in her OP.
And just because none of your nearest and dearest have come to grief (yet) by way of an RTA on one of the dry walls surrounding you (FFS) doesn't mean that Bosky hasn't either experienced it or can imagine it. So he might well be upset.
As might you be if one of your kids was killed in the scenario that BK posted, then volunteering information to help her homework whilst reliving the incident while you do it.
Maybe he just has a higher degree of empathy for those who posted to help BK with her storyline.