As would most. There doesn’t seem to be a scale of stupidity with which a person can use to say I am this amount of stupid. However, if the question you had asked was “How intelligent are you” there is a definable statistic known as ‘IQ’ which could give you a good answer.
Of course in this case I am being pedantic. Often I feel like asking “How stupid are you?”
Some people are as dumb as a rock, while others manage to be as dumb as a bag of hair or even reach the level of being as dumb as a box of hammers.
Some people are so stupid they would be quite unable to dispense unrine from a boot, even if the instructions to do were printed on the heel of said boot.