Ugh; I hate situations like this, i.e., where someone's tone is so stinging. How well do you know this other musician, and out of curiosity, who asked you to make the announcement? It sounds like you didn't just take it upon yourself to announce the party, so it seems unfair that he directed his comment just to you. If that's worth emphasizing to him, then send him an email to that effect. Otherwise, just try to blow it off.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher