Not in any way defending terfs, however: lightening your hair is NOT cheap and just because your roots are showing (natural color is growing out) doesn't mean you had a cheap service done. It just means it's time for another one.
Regardless, we shouldn't be attacking people for their physical appearance, even if they're terrible people. Being pretty is not the rent women pay to exist in the world, and failing to live up to your standards of beauty is not a moral failing. That includes hair and makeup and body modification (Botox, piercings, tattoos) choices.
Edit: also Botox ≠ lip filler. (Sorry I can't help myself lol)