Christ did not leave the Jewish community, He expanded the message of deliverance to all men. To leave is to take the cancer with you instead of curing it — case in point, with the PCUSA’s total apostasy we still see the EPC going ahead with pastoresses and there have been votes to allow deaconesses in the PCA. The cancer must be rooted out — STAY and root it out at the moment you see it (as the PCA has done) — to leave is wrong.
If they won’t stop, you need to separate from them. They have been approached dozens of times from different denominations and internally.
The go and talk to your brother approach has been done. Bible doesn’t say it will always work. If it doesn’t work, depart from them.
And that is the process that is accelerating in their denomination right now.