Lowercased lyn starts out sounding like a petty rant about tomatoes, then reveals that the tomatoes are standing in for a person. The first half complains about how awful raw tomatoes are: they don't taste right, and even cooked ones are only bearable in company. The second half repeats the same structure almost line for line, but now the target is someone the speaker once respected and still adores.
The comparison works because the humour slowly gives way to hurt. "Raw" becomes a word for unfiltered cruelty, and the speaker can only stand this person when their "vicious words" are softened or kept out. The line "you don't act right anymore" suggests the person has changed, and the speaker misses how things used to be.
The mood is wry, tired and quietly sad. The blunt, repetitive phrasing sounds like someone trying to stay casual while admitting that love doesn't cancel out being treated badly.