"WWHL" host Andy Cohen also hit back after being criticized for not posting about Vanderpump's loss.
In response, the "Real Housewives of Beverly Hills" star addressed the fan directly on Twitter and explained how she offers her sympathies to those in mourning.
"I personally like to send condolences privately when it is someone I know," Richards tweeted, tagging the fan, Vanderpump and fellow Beverly Hills housewives Kyle Richards, Lisa Rinna, Teddi Mellencamp and Dorit Kemsley.
I personally like to send condolences privately when it is someone I know.— Denise Richards (@DENISE_RICHARDS) June 22, 2019
Kemsley, who like Richards hasn't publicly sent condolences to Vanderpump, seemingly agreed with her co-star's message as she retweeted Richards' tweet and added the thumbs up emoji.
The Twitter user who called out Richards was consequently blasted by "RHOBH" fans and clarified his original tweet. "Wow got a taste of getting Twitter chewed out by other #RHOBH fans," the person wrote. "Conclusion of it all; I agree not everything has be done in public, it would've been nice to see (but not necessary). Mostly I was glad Camille and (especially) Brandi made an acknowledgement [sic]. That's all."
Richards isn't the only Bravolebrity to receive backlash for not tweeting about Vanderpump's loss. "Watch What Happens Live" and Housewives reunion show host, Andy Cohen, was criticized for not posting about the death just a few hours after the news first broke last week.
"Meanwhile @Andy is too busy tweeting about his world, and not a mention about LVP losing her mom Monday," wrote a woman named Cathy in a since-deleted tweet on Thursday. "Shame on you Andy."
"Cathy we were in touch privately on Tuesday, but I appreciate your concern about how and when I sent my condolences," the new dad fired back on Twitter.
Last Thursday, DailyMail.com reported that Vanderpump's mom, Jean Vanderpump, died Monday in England at the age of 84. The loss comes just a little over one year after Vanderpump's only brother, Mark Vanderpump, committed suicide at the age of 59.
According to the publication, Vanderpump is expected to fly to London in the coming week to make funeral arrangements for Jean. She has also reportedly stopped filming "Vanderpump Rules."
Two of the show's stars, Jax Taylor and Brittany Cartwright, will be getting married next weekend, but a source told E! News Lisa will not be in attendance because of the death. The show will presumably film the nuptials.
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