>
> 人間というのは、余程嫌いな相手でない限り、相手の短所より長所のほうに目が行くよう出来ていることが、さまざまな心理実験で明らかにされている、いわゆる「隣の芝部は青い」現象である

I do get the majority of the meaning of this sentence except the beginning
part:

> 人間というのは、余程嫌いな相手でない限り

Does this mean: In regards to Humans: There is a limit as to how much a human
dislikes another humanoid?

Continuing on:

The opponent (or other person) strong points rather than weak points are
looked at by humanoid 1, and this phenomenon is called the grass is always
green/blue on the other side.

Am I right?
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question
meaning
人間というのは、余程嫌いな相手でない限り
...限り in this case means "as long as ..." (see definition 4 of 限り on
jisho.org: <https://jisho.org/search/kagiri>).

So I would translate 余程嫌いな相手でない限り as "as long as it's not someone [subject]
very much hates". The whole sentence would be something along the lines of:

"The fact that humans are made in a way that they - as long as they don't very
much hate someone - draw their eyes towards others' strong points rather than
their weaknesses is the so-called "the grass is always greener on the other
side" phenomenon, which has been made evident by various psychological
experiments."
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answer