Lisa Vanderpump really did go there on The Real Housewives of Beverly Hills this week.

And we’re guessing the veteran reality star is having some regrets over it right about now.

Allow us to set the scene and explain…

On Tuesday night’s episode of this long-running hit, Vanderpump agreed to take a lie detector test to prove she never leaked information about Dorit Kemsley failing to return a puppy.

(That’s a whole other thing. You can read about it HERE.)

Upon sitting down for this polygraph, Vanderpump made the following joke:

“Just don’t ask me if Erika’s tucking or something like that because there are some things I can’t lie about."

Vanderpump then doubled over with laughter, but few observers found this remark to be especially funny.

Most, in fact, think it’s pretty darn insensitive.

For whatever reason, Vanderpump thought it would be downright hilarious to imply that Erika Jayne has a penis.

Aside from being silly and immature, this is a rather rude remark; it turns the legitimate topic of transgender identity into a joke. Or, even worse, a diss.

And Lisa Rinna was among the first to call her fellow reality star out for this quip, Tweeting: 

Who knew Lvp was transphobic? Well, we know NOW! #LBGTQ.

As soon as the episode aired on Tuesday, Candis Cayne also jumped in with a critique of Vanderpump.

“Oh come on @lisavanderpump joking about @erikajayne ‘tucking’ Ugly Trans jokes marginalizing our community are not acceptable.

"Being an ally doesn’t give you a free pass To make transphobic remarks. Do better,” Cayne wrote.

Jayne, who has not commented directly on Vanderpump’s attempt at an insult, did re-Tweet Cayne’s message.

As Cayne mentions above, Vanderpump certainly has been a strong ally of the LBGTQ community for years.

She has often hosted parties at her restaurants in honor of gay pride parades and/or events.

But this simply means she ought to be extra aware that words matter and perceptions matter and it hurts the cause she aims to support when she turns an important aspect of it into a punchline.

There are countless transgender individuals out there who are harassed on a daily basis.

There are people out there who really do "tuck," as Vanderpump joked on this installment, and they are likely appalled that Vanderpump would use this lifestyle as a way to take a jab at her rival.

Click on the link below to watch The Real Housewives of Beverly Hills online and see Vanderpump make her unfortunate remark:

Watch The Real Housewives of Beverly Hills Season 9 Episode 15 Online

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