Unbearable Persons

There are points in my life, that listening to certain people talk becomes unbearable.  If the person happens to be your boss, it would become a torture.

Is it because my tolerance level got lower? Is it because my expectation of people surrounding me got higher? Is it because my perception of life changed so much that I am no longer as patient and good natured to let them waste my time, insert their opinions, and dominate my environment? 

Or, is it because I became too self-inflated that I no longer think it's worthwhile to pick the valuable information from their rambling?

I know I am changing.  Hopefully always with self-reflection, and make conscious mindful choices.