Social justice warriors are fucking cultists foaming at the mouth, desperate for a target on which to vent their spleen. They're exactly the type of person who, in ultra conservative countries, looks forward to and gets considerable pleasure in stoning their fellow community members to death at the whiff of transgression regardless of what actually happened and the circumstances surrounding it. Anyone who is not 284% committed to X is a monster, especially a moderate. Grey thinking is a far worse crime than the extreme opposite viewpoint because it threatens to insinuate itself into the overall narrative, and insideously destroy it from within.
It could have been anything that set off @TismFarmer 's daughter in law. It could have been pointing out that Trump's death camps didn't manifest themselves in his first term and are unlikely to manifest themselves in the second. It could have been suggesting that sometimes the long-term "unhoused" often deliberately decide to remain "unhoused". It could have been drawing daughter in law's attention to the ill effects of importing a million immigrants a year into a country that doesn't have a fraction of the resources needed to support them. In this case, it was pointing to extensively documented predatory behaviours and suggesting that deliberately allowing these predators access to their prey may not be a good idea.
Ultimately, it makes no difference whether @TismFarmer 's crime was transphobia, or raycism, or homophobia, classism, or whatever. Daughter in law now knows that her mother in law is the worst type of person in the world: a grey thinker, a fence sitter, someone who refuses to follow the cult directions to the letter, and worst of all, refuses to pretend that she can't see the emperor's dangly hairy bollocks swaying gently in the breeze for all to see.