It is just Sinat Chinam – Causeless Hatred which causes the difference. Their is no real difference. In an ideal situation Jews should not be fighting with each other.
In our Hafatarah from Yechezkel the prophet is told by G-d that there will be a time that all Jews will be brought together. At this time all of the gentiles will recognize the special status of Am Yisrael. The Jews will realize that they should follow the Torah.
This is really a great time of year to discuss the subject of preventing hatred. This week we will be fasting for the fast of Asarah Betevet. The reason we fast at this time is to remember the destruction of Yerushalaim. The destruction occurred on Tisha Beav which is in several months. The siege which was made against Jerusalem started on the Tenth of Tevet.
As we all know the reason for the destruction was the short cited hatred which many Jews have for each other. The best advice which I have heard to counter one group’s hatred of another is to marry a person from that group. I am the child of such a relationship. It brings greater understanding of the workings. Israeli Moroccans should marry American Ashkenazim, Chasidim should marry Mitnagdim, Persian Jews should marry Syrians.