Sneaky hate spirals begin simply enough. In fact, that is one of the hallmarks of sneaky hate spirals - they are merely the confluence of many unremarkable annoyances.
Your day begins poorly.
The turning point:
The turning point is usually a minor but slightly jarring incident, initiated by some force of nature that cannot be blamed or scolded - like gravity or sleeplessness or wind. That last specification is very important. In order to send you into truly batshit crazy hysterics, the final straw must cause anger that cannot rationally be directed outward in any way.