…וישקהו [נקוד עליו] שלא נשקו בכל לבו ר’ שמעון בן יוחאי אומר הלכה היא בידוע שעשו שונא ליעקב אלא נהפכו רחמיו באותה שעה ונשקו בכל לבו.
Va-yishshakeyhu [he kissed him] has dots above it [to teach us] that he [Esav] did not kiss him [Yaacov] wholeheartedly. [However,] Rabbi Shimon bar Yochai says: “It is a Halacha that it is known that Esav hates Yaacov. Nevertheless, at that moment he became merciful and he kissed him wholeheartedly.”
Everyone asks what the "Halacha" is over here??
Some say [like Rav Moshe in the Igros Moshe] that just like Halacha doesn't change - so too in history the hatred of the Gentiles to the Jews will never go away.
New manuscripts that have been found show that this maamar Chazal quoted by Rashi might actually say "והלא בידוע" - It is well known and not "Halacha". Be that as it may, it is remarkable that in our developed civilized culture, hatred of the Jews is still so rampant and for no explicable reason.
Baruch Hashem our situation has never been better in so many ways but there is still some invisible force in this world that drives people to hate us for no reason. When people are anonymous on the Internet it is a fascinating window to see how prevalent this is.