While I agree with the fact that this kind of behaviour [i.e. randomly "hanging brain" (my new favourite idiom), unsolicited, in someone's DMs] is SO many shades of shitty in whichever context it happens, in this case in particular it really does work for building up context and highlighting the dichotomy between the type of people who send dick pics and the type of people they sometimes reach.

As a bottom line, it should serve as a good enough cautionary tale about keeping one's damned junk in their pants unless someone wants to see it, because one'll most likely end up looking like an utter asshole while also potentially ruining someone else's mood for literally no good reason whatsoever.