For most citrus the pith has no flavor at all, definitely not bitter. Most people object to the texture and blandness/lack of flavor, which I can understand. I have a bunch of citrus trees in my yard, and learned to not mind the pith, mainly due to laziness (I eat a lot of oranges) - and it’s a good source of fiber.
Why would someone do that ?
because the stringy bits, like the rind, are bitter, which changes the flavour of the fruit.
For most citrus the pith has no flavor at all, definitely not bitter. Most people object to the texture and blandness/lack of flavor, which I can understand. I have a bunch of citrus trees in my yard, and learned to not mind the pith, mainly due to laziness (I eat a lot of oranges) - and it’s a good source of fiber.