If he took offense then he should not have taken a move that allowed you to draw! If you get a draw, you get a draw... if it is his mistake, then it is not "A coward's way out", don't worry about other people's opinions of your moves... or about your offers of a draw... :-)
Seems perfectly fine to me; you trapped your opponent even though he had greater material.
This is called "perpetual check", and this position is drawn. Your opponent should have been avoided this kind of position. It is no "cowards way out"... it is a mistake by your opponent. If he is angry, he should be angry with himself, and not with you.
"You cannot win" does not mean "you must lose". "Draw" exists in chess' rules.
It is a part of winning to make sure there is no draw possibility.
obviously he did not make sure there was no draw therefore a draw was the correct outcome.
you should always take a draw if you can if you think you cannot get more.
but remember always to calculate when you are winning that there is no draw. it's hard but nessesary.
When a person plays the Fried Liver attack you should expect them to get angry at the drop of a pin. He was just angry because he didn't win, not because of any flaw of yours.
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