Never, lol. If anything, we need to quadruple down on it. Make it socially unacceptable to still be a liberal as an adult.

Part of becoming an anarchist is to learn why people have so little patience for liberals and other pro-Western ideologies. Part of becoming an anarchist is to learn to listen to these people, especially if they are yelling at you. If an "anarcho-curious" liberal cannot even attempt to make it over that microscopic hurdle, then they're not gonna attempt to unlearn any of their other baggage.

IMO, abandoning liberalism is part of the "ticket price" of becoming an anarchist. Liberals who refuse to abandon liberalism are enemies, no matter how nice they are or how caring they pretend to be or how much they adopt radical aesthetics.