Damn, it must hurt that you will die alone and childless, specially if they are women. But for me every time i see someone with kids i really want to finally find a significant other and have kids. As many as i can tbh.
But to be openly hostile to the idea is very fucked up. The things that people say in r/childfree are outright malicious and terrible and i cannot understand how they are so cruel against any children that appears in their vicinity. They have no fucking fault for your own bitterness.