I reiterate my earlier comment about it being childish. "You look like someone I should hate, so I am going to fuck with you in particular."
Oh the irony in these same people being quite fond of claiming it's everyone else that's the emotional snowflake.
> Other than it not being deliberate it was "rolling coal". To get the black soot you need to just have poor combustion of a diesel.
No. Rolling coal requires injecting vastly more fuel and making the mixture far richer than even the worst possible factory tune.