Passive aggressive behaviour is an expression of hostility in which people don't show their emotions directly. They are mostly stubborn in a particular way. They are difficult to adapt to any changes.
Passive aggressive behaviour can be seen as a habitual pattern of resistance to negative attitudes in response to requirements for normal performance levels. It mostly occurs at the work place where demands to get the target results are high. People with such behaviour avoid speaking their heart out and because of that they often face problems like low self confidence and lack of decision making capabilities.