Women who were quite strangers, mere spectators, were watching it excitedly, holding their breath, in fear of losing a single movement or expression of the bride and bridegroom, and angrily not answering, often not hearing, the remarks of the callous men, who kept making joking or irrelevant observations.
He was himself conscious that, except that whimsical gentleman married to Kitty Shtcherbatskaya, who had a propos de bottes poured out a stream of irrelevant absurdities with such spiteful fury, every nobleman with whom he had made acquaintance had become his adherent.
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The sentence should be deleted because it introduces information that is irrelevant to the passage.
The writer should deleted the sentence because it provides background information that is irrelevant to the paragraph.