The narrator of the story has a different attitude about the Time Traveller's story than the other listeners. How does he feel about it? (chap 12)

That none of the TT's guests (save the narrator) will believe TT suggests not that they merely find the idea too fantastic, but that they are unwilling to believe such a future awaits for them. As members of the ruling class, they do not heed the TT's warning of a class revolution. Instead, they remain concerned with the immediate future--when the cabs stop running, for instance--and not with preventing the dystopia the TT has described.