Absolutely not. It sounds like somebody needs to have a talk with this guy about the headphones and a few other safety issues. He's going to hurt himself and/or others at some point.
On that note, we had our first paceline accident at last night's tire ride. Tire contact. Three riders down, one with a broken collarbone and one with a bad cut on his arm and a carbon bike that's toast. It was a sobering reminder that pacelines/group riding can be dangerous. It's not clear whether anybody was riding recklessly last night; it may have just been a bit of bad luck.
In any event, I've thought twice about pointing out bad habits before to other riders. I've decided that I need to be a lot more assertive in that regard.
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