>>17382983those are referred to as "roots" showing, which happens after some time passes and the dyed hair grows out revealing the natural color - they often go and get this hard line "blended" touched up since like you say, they know it looks like shit. its an easy point to make fun of to tease, ask them if their hairdresser is sick or something, all women are hyper focused and attentive of their locks, to insult or draw negative attention to it is an easy way to dig deep right to the core of their main concern