You wish to justify your actions, and so you give
an explanation.  At least, that is what
you call it, while others might label your words an excuse.  Inside you know that you could have chosen a
more optimal course of action or choice of words, yet part of you rattles on, using
words to defend your less than optimal choice. 
That part is ego, which knows only how to defend itself.  Even when you recognize him at work he will
go on making excuses.  What can you do,
but laugh?  Laugh at the poor
fellow.  He is only doing his job.  Then tell him to go sit in the corner, as
always, while you bring your true self back to center stage and apologize, if
necessary.  If no amends are needed,
simply acknowledge how you could have done better, give love to all involved, even
to that little fellow over there in the corner, and get back to school.