Answer:
Nope it's not
Step-by-step explanation:
"dubious distinction" is not an example of a metaphor. It is an example of an oxymoron, which is a figure of speech that combines contradictory or opposite words to create a new meaning or concept. In this case, "dubious distinction" combines "dubious," meaning doubtful or questionable, with "distinction," meaning honor or recognition, to create a phrase that suggests an ironic or contradictory sense of recognition that might not be entirely positive.