Says the FAQ:
One or two bad posts will not cause you to be blocked from using the site.
But from reviewing my history on thirteen accounts, apparently four minuses override any number of pluses and neutrals. That's just the votes on answers: if you look at reputation also, it seems even more inaccurate.
I sincerely would like to hear something constructive, i.e., helping to construct something good, about this.
As suggested in the comments below, the implied threat of soon-to-be-blocked should not have occurred. But if the warning were actually valid, the question still stands: Please offer some explanation beyond sending me to FAQs that only confirm it should not have occurred.