I don’t think really that a majority of the population is going to die. I do think significant numbers of deaths will happen around the equator at some point in the near future and spark a functionally unstoppable wave of immigration towards the earth’s poles. This will result in its own strife but again will only cause a small percentage of more of the population to die.
Thing’s will eventually stabilize as human civilization adapts and green energy and carbon capture take off. Most of the population will survive but almost everyone’s QoL will be NOTABLY worse by various conventional metrics. Though likely better in specific ways due to certain medical and automation advancements.
Expect birthrates to continue to drop globally however and the earth’s eco system will drastically change and become much less healthy. Most of existing humanity will cling to life though.
I don’t see how this would matter though. In a dating app, someone who refuses to date zionists will notice if pro-zionism is on their profile and not match with them or even block them. If there is no mentioned zionism on the rightwinger’s profile and the rightwinger is trying to trick people into dating them whether the anti-zionist is able to post “No Zionists” on their profile is immaterial, the rightwinger will try to match with them regardless.