Beaten in the sense of being offended and withholding one's tears in the sense of holding one's peace rather than bursting out in anger.
Maturity is being able to control one's emotions / feeling rather than allowing them to control one's self. It is the ability to implode one's anger when offended in contrast to immature explosion of anger.
So if you are still venting your anger in public when offended, it implies that you are not yet matured.
