People from every culture, including various country leaders and several U.S. presidents, have been guilty of unintentionally offending people from different cultures through the use of inappropriate gestures.
The meaning behind the mudras is the symbolic energy we regenerate back into our body-mind. It is a non-verbal communication between the conscious mind and the subconscious mind. They are like powerful affirmations, but so much more.
The NHL is more than happy to profit from the enmity of its players. So it's a bit rich that they decide to cry foul when athletes actually act as if they have some sort of personal investment in their craft.