OP - while it is reasonable to be angry at your brother, some people are very entitled and annoying and some of those people also do not drive. But to put us all like that is a bit harsh - you are used to life with a car, you arrange your life that way, those of us without them are used to it and arrange out lives that way.
Like socializing, yours seem centered on going out places to drink. In my circle of friends, only 2 have licenses that I know of and only one still has a car. In the rest, 4 are medically not allowed to drive (though you wouldn't know that by looking at them and they're not likely to bring it up), including my husband who will only say he doesn't drive and wasn't good at it, most don't know about his medical reasons. So our socializing is mostly about hanging out at each others houses, playing games, painting, and such. I open my house two evening a week at least for people to come over and do stuff together, typically more. One of my friends comes so regularly by cab that they know where he is going and who by his number and time of call. We don't drink anyways so always able to get people a taxi home.
As for caring for family, most people with disabilities and health problems that I know prefer to use their own support network other than their kids. My FIL and GMIL are very firm on this, the former won't even be a car passenger so any emergency would be by ambulance knocked out anyways (and for both we had to struggle to get them to do when they were obviously having heart problems). We no longer live close enough to give that kind of support (used to live with in-laws), and they travel less as there health deteriorates so we call them regularly, check that people are visiting them often and that their appointments and meds are going well, and set up electronics so they can do video calls now and see their grandkids more often if only by screen which has done more for their health than anything else I've seen recently. There are many ways to care other than driving.
I have 4 kids, a social life, and a business and run my general life without a car. Yes, they can be useful, but not having a car doesn't automatically equal someone who is an uncaring moocher. We just arrange our lives differently.