All it means is that we haven't quite mastered a particular situation yet. It brings us to the realization that there is still more to be learned about ourselves. Blaming anything in our outside of ourselves is useless, it only aggravates the situation and adds more unwholesome thinking to it. In order to avoid unskillful reactions in the mind, we have to be attentive and know the way our mind works before we verbalize. We can learn about that in meditation.
Awareness is the prime mover in meditation.
It isn't viable or useful to have calm and peaceful mind states without being completely aware of how we attained them, remained in them and came out of them. When that happens, and unwholesome state has already been established. Before the mind is allowed to fall into this trap, a dense and unpleasant feeling can be noticed, which acts as a warning that an unwholesome mind state is approaching, which can be dropped before it has even established itself. When we notice that a mind state is approaching which does not seem to be accompanied by peace and happiness, we can be sure it will be unwholesome. The more we train ourselves to be mindful of our mind states, the more we realize the unhappiness we cause ourselves and other through unskillful thinking.