what does it mean if someone takes a negative experience and applies it to everything

This could indicate that the person is experiencing cognitive distortions, such as overgeneralization or catastrophizing. This may mean they are viewing all situations through a negative lens and interpreting everything in a pessimistic or defeatist manner. It may also suggest that they are struggling with emotional regulation and are finding it difficult to see the positive aspects of different experiences. In some cases, this behavior may be a sign of depression or anxiety.