Larkin observes the distinctions of class through the areas that they live in, "floatings of industrial froth". He mentions the "wide farms" that some of the people live on and next the floatings of industrial froth", he seems to write about both places in the same tone.
Larkin's pessimism rears again in the 2nd verse when he says the "sun destroys, he interest of what's happening in the shade". Larkin is obviously on a different wave length to most people as to most people they would think that the shade destroyed the sun, the fact that Larkin thinks differently to people could mean that his observations may not be precise to different people, it depends on how you look at the world.
Larkin mocks the women at the wedding, "parodies of fashion". He seems to scorn upon fashion and laughs at the fact that these women think they look great but to him they look ridiculous. These could once again be Larkin looking at the women differently to how other people do, as to some people these women might look fabulous, this could also alter how precise the poem actually is.
Larkin does not understand the concept of marriage and children. He looks upon the wedding he observes as a horrendous event, with the "mothers loud and fat" and "an uncle shouting smut". To Larkin a marriage is like a "happy funeral", he considers them to be like a ceremony to mark the death of your freedom. A marriage is an ordinary event and Larkin is not an ordinary man so in that concept he is a recorder of the ordinary, although he does not understand them. Larkin chooses to describe the "uncle shouting smut" instead of the well-mannered people that were more likely than not present. He does this because he seems to be drawn to these types of people, Larkin seems to shut out happy people or paint a negative over them this reflects on his personality. To Larkin his observations are correct but to other people they may not be quite so precise.
