Lillith's "tainted" is only three short lines, but it captures a quiet and unsettling idea: the way we see things can be bent by what we want, hope for, or have grown used to. The "tint" works like colored glass. Put it on, and the whole world takes on one shade, so nothing stands out the way it should.
The red flags are the heart of it. Red flags are meant to be obvious, the clear signals that something is wrong in a person or a relationship. Here they "look normal," which suggests the speaker knows how easily danger can blend in once your view is colored. The poem doesn't say what causes the tint. It could be love, loneliness, habit, or hope, and that openness lets readers fill in their own experience.
The mood is calm on the surface but uneasy underneath. The lines step down the page, almost like someone slowly sliding into acceptance. There's a hint of regret, as if the speaker sees how this happens only in hindsight.