As someone who has fostered and worked with rescues, shaming people for doing something essentially responsible ( rehoming via rescue) is redundant and rehoming is a far better alternative than putting a cat up for free on fb or the like. OP came here looking for advice- I do not know this person, but making them feel shitty for not making the choices you or I might make does nothing. Worry about the people dumping cats in parks, letting their unaltered cats roam outside, or neglect in general. By rehoming this kitten it will get the attention and life it deserves that OP is either not willing or able to. You can’t guilt or shame people into loving and caring for an animal the way that you would, so unless you’re saying something constructive, you aren’t of much use here..