The short answer to this question is that Tennyson's Ulysses doesn't like his wife at all. A more specific answer would be that, for Ulysses, Penelope is a personification of everything that he hates about infirmity and domestic exile.
Though Tennyson only mentions Penelope once (Ulysses dismisses her as "an aged wife" ), much can be read into her presence in the poem. All in all, the poem discusses the anguish of growing old, losing one's strength, and having to relinquish the glorious adventures of youth. Ulysses' wife Penelope is a representation of Ulysses' frustration with domestic life and growing old. She is both a symbol of old age and a symbol of home, and so she is a perpetual reminder for Ulysses that, rather than struggling with the gods on "the ringing plains of windy Troy" (17), he is old and bored and confined to Ithaca, reduced to nothing more than nostalgic longing. As such, though she does not have a large direct part to play in the poem, Penelope represents the fundamental conflict of Tennyson's text.