The social contagion aspect is huge and undeniable, and this ain't just people encouraging other people to follow some meaningless and harmless trend, this shit has real harm, causes real harm and shortens the lives it doesn't cost, leaves people with lifelong medical problems.
Toxic acceptance, pathological tolerance, whatever you want to call it is not good for society or the people living in it. Some things should not be accepted, and shit needs to be called out when its doing irreversible damage.