It's not that hard - Mander

::: spoiler alt text Screenshot from rosypiriani @ instagram: Stop calling Gaza an “open air prison.” Prisons are filled with convicted criminals. Prisons have food. Prisons have water. Prisons have electricity. Prisons have medical treatment. Gaza is not a prison; it is a concentration camp. :::

This meme is quite anisemitic! The comparison to concentration camps is just morally wrong. Critique of the israeli state and the government under the current politicians is absolutly nescessary, but that is no reason to go to an antisemitic place.
Concentration camps have a history outside ww2, also Jews were not the only ones to be sent to camps lest you forget about the disabled, romani, gays, various slavs, or socialists who were also killed by Nazi Germany

Don't forget the Cubans, the Boers, and the Japanese.

All three were still camps, because more than just the Germans used them.