Zero covid is supported because it is a refreshing and inspiring counterpoint to the shambolic covid responses in these western countries, where 6-7 digit deaths are recorded, and shows what a competent state can achieve to protect their people. It is inspiring to see that when all you see around you is skyrocketing homelessness, poverty and inflation.
Bear in mind that if these same western countries were able to mount a working covid response like China did in 2020, covid would have effectively ended there.
In addition, we can all see that the western hate for zero covid is driven by jealousy, in the same way dropkick fans of premier league losers view the winning team.