Should have just left me alone

A distant relative calls me to tell me that my step mother is dead
She lives on the east coast, I live on the west coast
We got along but I wasn't to close to her
I arrive at the funeral
All these people I don't recognize are crying
They all look disheveled and mousy
I'm taken into the room where the casket lays
I ask the funeral director to open the lid
There's a body bag inside the coffin
I open the zipper halfway down near the head
As I'm about to see the face, someone taps me on the shoulder
It's my step mother
She said, "Why don't you zipper up the bag."
"We told you it was me, so you would come down and pay your respects"
I said, "If your not dead then who is it!?"
I continue zipping down the bag
It's my biological mother!
My mother had me taken away at a young age due to her hard living lifestyle
She was a groupie with many rock bands back in the day
She was a druggie & alcoholic and a petty thief
A few days ago, they found her stabbed about 20 times all over her face & body
Now I see why this was a closed casket ceremony
She owed a bunch of people money
I despised her then
I despise her now
My step mother knew that I would have not come down to pay my respects towards her
I became enraged
I told her, never to call or acknowledge I exist
You betrayed me and made me look like a total ass
I walked out, never to be seen or heard from again