Possible SPOILERS below!

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Anyway, I never really understood why Jecht was always picking on his own son.
What was his problem?
He constantly goes "you is da suxx, you can't do anything, moron, you're weak" etc.
And then suddenly Auron comes out and tells Tidus that Jecht loved him, and didn't know how to show it...?
What was that?

If Jecht loved Tidus, then why the heck was he acting like such a bastard all the time?
How did his being unable to show his feelings make him bully his own son?