Though Tyson doesn’t personally believe in aura, he is amused by the comparison to his Synesthesia.
Rather than showing the nature of a person, Tyson’s Synesthesia is more reflective of his view of that person, but he understands where the comparison comes from.
More generally, Tyson appreciates the idea of aura and - though always respectful of other’s beliefs - aura is something that Tyson finds easier to understand why other people believe in it.