It isn't like they are bad people, but there are other things I will inevitably end up gravitating to instead.
But it isn't like I'm alone because I have other things to occupy my time. There are times that I did wish I had other friendships but I end up putting those feelings aside when I start working on something. For better or worse I am lucky to be able to say this. Some artists say they can only survive and keep working by being able to be alone for extended periods of time.
When I don't get too attached to anyone the pain of losing them doesn't really come. And the people I do care about I've actually made miserable and angry by the number of times I've brought up that I am going to die someday and that I'm trying to live in the moment with them and acknowledge the transience of being alive with them. At some point continuing to acknowledge the fact that being alive and having known them is a miracle in front of them is counterproductive, and in the end it probably doesn't make dying any less painful.
After doing all that I don't understand what else I can possibly do but continue being alive.
However, it's just an inspiration and it must be proven in its newly applied field - proof in context of category theory is not valid in the context of inter-personal relations.
Perhaps that serves to illustrate why it is rude. If that doesn't help, then just remember that it is. Good manners don't always need to make sense to you, sometimes they only make sense to other people.