It's indeed very difficult to understand what is the reason people perceive and say they see arrogancy in the Laine's statements. As Finnish I haven't perceived such arrogance, not even when he made that famous Draft interview from his bed (?) saying what he did. I can't believe that people's registers could be so different around the world that they could just plainly misinterpret Laine. He have healthy self-confidence, and tendency to say what he think about this or that without offending others or trying to whitewash his own faults. He have excellent ironic and little bit sarcastic sense of humor, and when/if he says something that could be read as unfriendly arrogance as a quote on a paper, it's always made with friendly humoristic tone.
His English is not too bad, but still he lost a lot of his personality via English interviews. Even then he manages make often very quotable statements making interviewers and audiences laugh. Low key jokes combined with laconic output.
I fail to see where is that 'arrogance' -part in Laine's personality. On-ice it is however, a basic requirement for every goal scorer to be successful. One needs to be arrogant to be able to conduct goal scoring schemes with enough high determination. Maybe his success in this matter is the main source of the misperceptions for some.
Laine's celebrations are just like the man's goals.