Whataboutism is not an effective rhetoric device, and is unlikely to win any arguments nor to convince anyone. We can also talk about Tibetans who were annexed but not displaced, we can talk about Chagossians who were displaced but given citizenship. We can talk about Japanese Americans who were displaced, given the right of return, and payed reparations (in my opinion too small of a reparation). And we can even talk about Cyprus, I‘m not very well versed in that history, but I’m sure there is something to talk about there.
Point is human rights have been violated in multiple occasion throughout history, all around the world. We can talk about any of those all day, but it won‘t get us anywhere. Point is also that Israel is one of the current violator of human rights, and deserves to be called out as such, irregardless of other human rights violations throughout history. But the main point is Palestinians deserve to have their human rights, which they have been denied for 77 years, and are still being denied.