If you are disposed to say that you possess characteristics that you manifestly do not have, then you may be either purblind, deluded , stupid or all three.
There are many who would deny ever feeling superior or inferior, happy in their neutral. non-judgemental, uncritical way of being. On the other hand, if you are required to say whether something or someone is good or bad, then it is almost impossible to do this and somehow be in all truth, non-judgemental.
It is good to remain steadfast in your convictions, but retain a degree of flexibility. A declining of the verb 'firm' -
I am firm
You are stubborn
He is pig-headed