Bethenny Frankel says Ramona Singer's remarks about Dennis Shields were "despicable."

The 48-year-old discussed Singer's comments about Shields, Frankel's late boyfriend, during Wednesday's episode of "Watch What Happens Live."

"It was in really poor taste. It was actually fairly despicable -- that would be a pretty bad word," Frankel told host Andy Cohen.

"People have come up to me and said that over the course of the last 10 years she's done some pretty nasty things, but that was by far the worst," she said of Singer, her "The Real Housewives of New York City" co-star.

Singer had criticized Shields, who died of a suspected overdose in August, in an episode of "The Real Housewives of New York City" last month.

The footage was filmed three weeks after Shields' death.

"How smart can Dennis be?" Singer said after one of her cast mates praised Shields' intelligence. "I mean, he was on drugs."

People said Singer apologized to Frankel and Shields' family in a post on Instagram Stories prior to the episode airing.

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"I cringed when I saw what I said about Dennis in tonight's episode. It definitely wasn't one of my finer moments," she wrote.

"I respected and liked him very much and I sincerely apologize to his family and Bethenny for my thoughtless comments."

Frankel told Cohen she doesn't have a grudge against Singer.

"I don't harbor resentment," she said. "I'm not angry, because I don't feel anger anymore the way I used to in the show. You can't live in it, you know, I've been doing it for so long."

"The Real Housewives of New York City" returned for an 11th season on Bravo in March.

The series co-stars LuAnn de Lesseps, Sonja Morgan, Dorinda Medley and Tinsley Mortimer.