I have explained to others why I chose to respond this way.
This was a diss piece. Megan had no critical arguments of her own for me to analyze or respond to. You cannot just say "Death penalty! Orhhorrrrrr", and expect a dignified response from me.
All around the world, Asians and Singaporeans have been spat on, and even beaten in the streets for the color of their skin.
Given this, I don't think a sharp rebuttal, however mocking, is going overboard.