No post-left anarchist I know categorically refuses to work with Leftists, we just prefer to not operate in the modes we associate with the Left. Maybe some of us disassociate with everyone who identifies as Left or Right, but I doubt that exists as a common pattern.
I dialogue with open-minded people, and deconstruct the ideologies of close-minded people. I associate with green anarchists, luddites & zero-work advocates & productive play promoters, family, friends, people who engage in direct action, solidarity unionists, unemployed people, students, domestic and migrant laborers, festival goers, event attendees, strangers, travelers, youth, onlookers...I can find at least some common ground for interaction with most anarchists and point out my own overlaps with people who do not call themselves anarchists, enough to find resonance with them. I volunteer with youth and that gives me an opportunity to engage in an introductory discussion about different perspectives.
As a pl@ I differ in theory, orientation & strategy than the Left, but people who identify with the Left do not necessarily automatically refuse my preferred methods of association (impermanent, direct, spontaneous, intimate, mostly but not always informal) nor embody the celebrity managerialism I loathe. Even if someone endorses bureaucratic unions or political parties that usually doesn't prevent them from relating outside of those. I typically "organize" with people to the extent that we share an affinity, mostly initiated by me interjecting something critical of the status quo, leading to a search for shared experiences (e.g. disliking having a boss, feeling powerless), and common values (e.g. self-determination, partnership), refining a mutual critique to our situation, and finally culminating in some sort proposition for action followed by review.
TL;DR: Post-left anarchists I know tend to organize with whomever it makes sense to do so with at the time for as long as it makes sense, and involve ourselves in intentional explorations of affinity that allow for divergence, conflict, and disassociation.