I didn't really lose any respect for him.
He waited until an appropriate time and voiced his opinion to his coach. I don't see how it makes him any less 'classy', it's seems more like passion for his sport mixed with frustration in his coach to me. The Ducks basically begged him to come back for 13-14 and then Boudreau gave him 3rd and 4th line minutes every night. His stat line was actually 9 G and 18 A for 27 pts which for a 3rd liner isn't really that bad in today's NHL, especially for a 44 year old. During the playoffs, he got pretty much 4th line minutes and managed 0.5 pt/game which was better than most of Anaheim's squad. I would hardly blame Selanne for being upset at being a scratch in that situation... [Saku Koivu might have been a better choice given his playoff performance]
I do think this speaks towards Boudreau's ability as a bench boss, though. He's had trouble getting teams to perform in big games (1-5 record in playoff game 7s). If he can't rally a team in the playoffs, his regular season record is a waste.