"We consider Palestine as part of Arab Syria, as it has never been separated from it at any time. We are connected with it by national, religious, linguistic, natural, economic and geographical bonds." Muslim-Christian conference in 1919 in Jerusalem.
A defined Palestinian identity began to be formed with the creation of the PLO in 1964 and in 1968, just a year before Golda Meir's comments, the PLO finally defined who was a Palestinian.
Prior to 1948, Palestinian was just a term of those who lives in the region, whether Arab, Druze, Samaritan or Jew(plus Armenians, circassians etc). Arabs in the region rejected the term to describe themselves branding it a Zionist term. And either stated they were south Syrians or Jordanians. From 1948 pan-arabism was all the rage with Nasser in Egypt and this lasted until the 1960s when a distinct Palestinian identity occurred, especially after 1967.
Rashid Khalidi's book on Palestinian identity states Palestinian identity has never been an exclusive one, with "Arabism, religion, and local loyalties" playing an important role, he cautions against the efforts of some extreme advocates of Palestinian nationalism to "anachronistically" read back into history a nationalist consciousness that is in fact "relatively modern".
You can discuss as an adult or you can say "you don't know what you are talking about" as a retort like a child.