Simply put, it was a battle over semantics. The Samaritans believed that the Pentateuch was the only Scripture worthy of reading. The Jews also had the historical books (1 and 2 Samuel, 1 and 2 Kings, 1 and 2 Chronicles) and the books of the prophets; basically the Old Testament. Also, these two groups vehemently disagreed over where the proper place was to worship God. The Jews thought worshipping God in
Now the Samaritans had a history of being from a partly pagan ancestry, though were in all effects adherents of Judaism. Regardless, the Jews despised the Samaritans, and the Samaritans could at times be hostile to the Jews in return. In fact, the Jews thought that they could become contaminated by even traveling through Samaritan country, so they would cross over the Jordan river and go through the Transjordan area to avoid Samaria altogether. Who started the taunting and the battle between prides? No one knows, but both groups were not 100% innocent. The pride of the Samaritans over the zeal for the Pentateuch would lead them to taunt the Jews, and boast in their holdings of more ancient copies of the Pentateuch than the Jews owned.
The Jews returned in kind, and rejected the Samaritan copy of the law, and publicly denounced that Samaritans were of any Jewish birth. In fact, the Samaritans were publicly cursed in the synagogues; they could not serve as a witness in the Jewish courts; they could not be converted to Judaism; and the final blow was that in Jewish minds, they were excluded from the after life.
So why in the world would Jesus, who was a Jew, not only go through