That is simply wrong. Palestinians were first attacked by the British, supporting the Zionists, in the 1930s. Then, in 1947, during plan Dalet, Israel attacked Palestine and the surrounding Arab states.

Before that, of course, they colonized Palestine under the shield of the British empire.

An easier way to disarm this argument is: Why did the Zionists come and displace the Palestinians? And who would respond peacefully if you try to displace them?