"I don't think I've got bad taste. I've got no taste"

This quote by Graham Norton is a humorous way of expressing his point of view on his own sense of design. He is implying that he does not have a certain style or taste when it comes to style or various other visual options. He is not claiming that his preference is bad, but instead that he does not have any particular preference in any way. This can be interpreted as a means of sharing his absence of rate of interest in fashion or other aesthetic options, or maybe seen as a way of revealing his humbleness and also self-deprecation. Regardless, it is a humorous means of expressing his viewpoint on his own feeling of design.