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I once was eating by someones house and he asked the above mentioned question. He answered that it was for toeles, by stirring Esav to hate Yakov that would keep clal Yisrael on track to do ratzon hashem.
I think this is good according to the Arizal that Yischak knew Esav was a rasha and wanted to give him the blessings for this very reason, so that clal ...
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I want to post what my own family discussed when the question came up, as some of the suggestions may be helpful.
My son-in-law asked his Rav, who said that it technically is not going to be lashon hara, because there was no way that Esav was not going to find out.
That does help in the rules of lashon hara, but of course there are more conditions.
My wife ...
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