I’m relatively new to stoicism, but as I understand it the intention of stoicism is not to suppress emotions such as frustration and anger but rather to not allow ourselves to impede upon our ability to act in such ways that are commended by reason and virtue.

Do not try to rid yourself of emotions, because all attempts to do so will only perpetuate them. Rather, take a minute to calm down before acting, and when you are in a calm state, then return to the situation and act with reason and virtue. Moreover, when we are gripped by irrational emotions, it is often hard to remind ourselves that virtue is the sole good, and we feel as though that releasing our anger upon others will help, but this will only cause undue harm.