It seems at first like the speaker might be insulting his "mistress." Is he? What evidence supports your answer in Sonnets 130?

For most of the poem, the speaker has a huge list of things his lover cannot compare to. The speaker thinks his mistress is tainted compared to things like snow, coral, and perfume. In the end, the speaker says that his mistress is actually more rare than all these things and proclaims his love.