Haha!! Its def legal!
Its totally fine to have any emotion you like, the question you should actually ask yourself, is does this emotion directed to someone else, serve me right now, at the poker table. The answer is likely to be no, so I would try to let it go.....if the apology was genuine, then its not personal.
Even if they didn't apologise, I would suggest its not helpful. Its easy to get offended by other peoples actions, whereas its much better to try and focus on yourself!