Please don't turn uncivil, even if someone is wrong about homelessness. It helps nothing to damage the site you're contributing to.
There is currently a well-funded political campaign, backed by VC money, to change conservatorship laws in California to snatch homeless people off the street and involuntarily institutionalize them. You are doing serious harm by allowing people to spread misinformation here without challenging them, and punishing people doing the thankless work of correcting them.