Well, perhaps when one has a lot of needs that aren't being met one automatically is less empathetic; less charitable... because it's a survival mechanism. (I guess it's a viewpoint that could explain some current social trends, too.) The meaning of this, is that humans are built to take care of themselves first - and when those basic needs are met, then they reach out to others. And it's most likely a temporary condition; I don't believe you're an inherently judgemental, mean person at all. One just doesn't have anything to give when one needs so many things, you know?
Another way to look at this, is from the FOO-environment: Nm & brother sure 'nuff took care of their needs... ignoring the kids care, didn't they? Your brother with his kids... Nmom with your needs. This builds up a lot of survival defenses in a person; I know I still struggle with resentment & wanting to blame someone... because I often don't know what I need; I don't ask for it (and sure don't have any confidence that asking results in getting); and then I'm angry and resentful... because I feel like I'm bustin' my butt and no one else is helping. At least, that's my self-fulfilling prophecy cycle, you know? I've seen it over and over and even when the steam is coming out of my ears and I'm on the verge of kickin' proverbial a$$... I still know this is exactly what it is... and what I really NEED has to come from ME, in this situation: I have to ask specifically for what I want/need - and then release the outcome... I can't put any conditions whatsoever on how, when, or even IF my request is fulfilled. And I have to keep asking....
... in your situation, I hear very loud & clear that you really don't want to be accepted and part of the shelter environment. Understandable, I think. But it also sorta reminds me of a present-day experience that could help resolve the old FOO scripts and dramas, too. You are NOT your FOO... and it's understandable that you don't want to be "accepted" (under their terms) and "belong" (in that situation). So it's symbolic in a way: the quest to get out of the shelter [might] = the quest to separate "you" (in your feelings and thoughts about yourself) from you FOO. Possible? I sure don't know... so you'll have to just chuck this if it doesn't fit.
I don't know why this other thing keeps coming up and it seems irrelevant and silly to me; but it's something that wants to be passed on to you and it's persisting... it's an old Zen saying about how the goal of zazen is:
to be at home in the homeless home