As I said it is all of the overall Prophecy of the Messiah, if you r Jewish friends ask again ask them why their ancesters did not believe the Messiah was born in Bethlehem.
Anyhow, as I have answered above, It is a word play, Nazerene. It is like me calling someone from Glasgow a Glaswegian! yet the nazerene has an underlining meaning '''Branch"", As Pete said in his post 'Netzer'.
And tell your Jewish friends that Matthew was inteneded for a Jewish audience and in all time for everyone, another hint for this is the use of 'Kingdom of Heaven' and no explanation of Hebrew/Aramaic terms as Luke.
Anyhow, that is the answer, and if you don't believe or your friends well thats up to you... you will not find in the prophets saying he will be a nazerine. but they all allude to it.
When Matthew wrote this he probably had 'Isaiah 11:1-2' in mind along with Samuel etc.
in love
Phil