I understand your logic perfectly: to humiliate and insult whoever you're replying to. Your motivations aren't complex.
I'm not "so damn angry", I responded because your icon is distinguishable and I've never noticed you as a poster up until a week or so ago, and in that time you've been posting a ton, almost always in a negative way in a really similar format—that being to imitate the person's phrasing in a mocking and condescending tone.
"I'm sorry you can't......flaws in too." What does that even mean? The fact that you're decision as to whether to continue to ski or not is influenced by what other people choose to do—or not do—while skiing is lame.
My "reason(s)" are that I absolutely love the feeling I get while skiing. I love it. I'm completely in the moment, free of worry and anxiety, and it's one of the very few things in life that I can honestly say that there's nothing else I'd rather be doing while I'm doing it. I don't give a fuck about what pros are doing on skis, in that what they choose to do doesn't interfere with my enjoyment whatsoever.