Nihilism is one of those concepts I can never remember a definition of, so I end up having to look it up every few years.
Recently I've been called nihilistic for my opinion that bringing children into this world is irresponsible, because they will be likely to experience suffering, without an opportunity to first consent to being born. If nihilism is defined by an absence of moral values or a lack of caring, I don't see how it would apply to my stated position. I choose not to have children precisely because I care, and couldn't justify taking the chance that my child wouldn't want to exist.

I'm probably misunderstanding the concept, but so far I haven't been interested enough in it to do a deep dive and read Nietzsche or whatever.