Blue is often associated with sadness, depression and gloominess. It can evoke feelings of melancholy, nostalgia and hopelessness. This is because blue is a cool, muted colour that is often linked to water, the sky and the night. Some people find these associations depressing and bleak.
Additionally, blue can also be seen as an uninviting colour that inhibits social interaction. It can make people feel uncomfortable and uneasy, which is why it's often avoided in public spaces like shopping centres and cinemas.
On a more personal level, some people might simply dislike the colour blue because they prefer warmer, brighter, or more vibrant colours. This is purely a matter of personal taste and preference, and there's nothing inherently wrong with liking or disliking a particular colour.