I think what gets me about the Toe Thing is that it’s a toe. It’s not even a romanticized or symbolic body part, like Percy Shelley’s preserved heart, or Galileo’s dedicated finger. It’s just. A toe. They’re already gross, just by virtue of being ugly little stubs attached to your feet.
Keeping a vial of your lover’s blood as a pendant is weird, sure, but at least blood represents something and has macabre beauty to it. Bones and teeth are classy and universally traditional.
It’s not even just that it’s preserved soft tissue. An eye would be very disturbing, but I could respect that - eyes are precious organs, and having your own lost eye in a jar somewhere would be kinda cool. Umbilical cords have profound spiritual significance in many cultures for obvious reasons. I wouldn’t even bat an eye if someone preserved a teratoma - rare or unusual organs/body parts have their own appeal, either as scientific curiosities or magical items.
But… toes are just. Toes. A fleshy, preserved finger would be nasty, but fingers are noble appendages. While feet as a whole are often considered rude, they’re useful, and an entire foot could be poetic, a single toe…