This really has nothing to do with French jews but everything with Zionistic Israel. The alleged words of the shooters where 'You kill my brother I kill you'. I don't really think French Jews killed his brother. So (considering this article I think I have to elaborate here) probably he was refering to the Palestinian situation here, which means he was mistaken Jews for Faschist Zionists. This is what years of polarisation has lead to. Thank you Israel. You managed to turn the holocaust into a farce by creating one for the Palestinian people, and dishonour the memory of those who died by abusing it in your propaganda and rethoric.
Judge orders Jerusalem Gay Pride attacker to undergo psychiatric evaluation (Haaretz)
from the article: Toulouse shooting exposes rift between French Jews and Muslims