Are there are NPCs you would never allow your sim to date or befriend

I am working on marrying all the premades into my large rotational families, so I mostly have them completely ignore all random townies and for now the unhoused sims like the mermaids and Dirk Dreamer and Erwin Pries. I had a few townies drawn in before I made that rule, and I may change my mind about the unhoused once I use up all the housed premades, but for now that's what I'm doing.