It depends on the type of "privacy" you need, but your ISP isn't a threat if you're using good crypto, unless you're just worried about connecting to marked IPs

It depends on the type of "privacy" you need, but your ISP isn't a threat if you're using good crypto, unless you're just worried about connecting to marked IPs, in which case a proxy, VPN, or asking your collaborator to open up a new IP are all viable resolutions.