Sentence structure + 人がわるい


Related to
[this](https://japanese.stackexchange.com/questions/68083/translation-
feedback-request). At this point, the speaker has won the preliminaries. The
elderly chairman of the event, a friend since the previous tournament,
comments that the speaker has won a second time
(やはりこの地域で一番のブレーダーはspeaker君でしたか). Speaker responds with:

  * あったりまえだぜっ!
  * だいたいそんなことは
  * バトルする前から
  * わかっているのに会長も
  * 人がわるいなぁ〜

I get as far as "Naturally!" I'm also thinking バトルする前からわかっているのに is a full
clause and means "even though {you} have known {this} well before I did
battle", but I don't know how to put だいたいそんなことは and 会長も人がわるいなぁ together.
Specifically, そんなこと is marked as the subject, so how does that relate to the
adjective/verb 人がわるい? Is it something like "That sort of thing essentially
makes the chairman a [bad person]?"

Furthermore, I can find little on the translation potential of 人がわるい. I've two
questions about this term. For one, I assume that the speaker takes issue with
the chairman not being 100% certain he'd win, so would "having poor judgement
(of skill)" be a reasonable translation? For two, 人がわるい strikes me as a harsh
thing to say, so I'm curious about the politeness level here. How rude is the
speaker being?

If it matters, the chairman responds that he knows how hard everyone else has
trained since last year and that it was justified not to presume the speaker
would dominate the preliminaries once more
(それはちがいますよspeaker君.あなた達が海外へえんせいしている間,
みなさんは今回の大会のためにとしもつらいとっくんをかされていたのです.だからけっしてspeaker君が勝つとはかぎらないと私はそのようにおもいました).
The speaker acknowledges he's been a jerk after that.

Thanks in advance.




I think your source of confusion is the interpretation of のに, which in this
case is sentence-end のに described in the following questions:

  * [What does のに mean at the end of this sentence?](https://japanese.stackexchange.com/q/42408/5010)
  * [What is a good synonym for「〜のに」at the end of a sentence?](https://japanese.stackexchange.com/q/11426/5010)

You should read this as two sentences, like this:

> だいたいそんなことはバトルする前からわかっているのに。会長も人がわるいなぁ〜。  
>  To begin with, you should've known this (result) even before I battled, but
> (you actually made me go through the preliminaries)! You're so wicked!

だいたい is "in the first place", "to begin with", "before discussing this". そんなこと
("such a thing") refers to the the result of the preliminaries. 人が悪い is a set
phrase meaning "mean" or "wicked". It does not sound that harsh in a friendly
conversation. So the boy is complaining because he believes the chairman sent
him to the preliminaries even though the result was evident to everyone
(including the chairman).

