I feel like Kovalchuk has always been a poor sport so this doesn't really surprise me. It's a heat of the moment type thing so I won't hold it against him. But I think it speaks to a lack of maturity compared to guys like Ovechkin or Malkin. Ovi really should have been captain.
EDIT: My first sentence is meant as more of a matter of fact statement than an insult. I think to get to that level you need to be ultra-competitive and sometimes that comes out in ways that are unattractive to people. Kovy was one of the more competitive players NJ ever had in my opinion, and doubly so when it comes to representing his country.