I have gotten a taste for bitterness. I think our repulsion to bitterness stems from a mildly silly thing evolutionarily, where our bodies decided that bitter=poison, but so often it isnt the case. From drinking black teas and coffees, I feel like the bitterness of a grapefruit can become a positive aspect for it. Or just eat the flesh with sugar on top the way I used to as a kid.
I'll give the red grapefruit a go today, we'll see how it goes.