Updated at 9:45 a.m. Saturday: Revised to include response from a Richardson council candidate and to note that Dunn's public Facebook account is no longer active.

A Richardson City Council member has apologized after posting what he said was an "offensive" remark about newly elected U.S. Rep. Alexandria Ocasio-Cortez, D-N.Y., on his personal Twitter account this week.

"The words I used were offensive," Scott Dunn wrote on Facebook Friday evening after criticism erupted on social media. "I am responsible for my own words and actions. I apologize to anyone who finds what I said offensive."

The date and context of the councilman's Twitter post are unclear because that account has since been deleted, but images show that in reply to another post by Ocasio-Cortez, Dunn wrote: "The embarrassment is to have bimbos like you with nothing between your ear."

1 / 3Scott Dunn 2 / 3Paul Voelker(Ashley Landis / Staff Photographer) 3 / 3Alexandria Ocasio-Cortez

Dunn said he posted the tweet "in defense of the President" and his recent State of the Union address.

The post drew shocked and angry backlash, including a statement from Richardson Mayor Paul Voelker, who assailed Dunn's "disparaging" remark and said he was "extremely disappointed and embarrassed."

"Richardson's values are best upheld when we engage in civic discourse that is civil in tone, respectful of others and designed to produce constructive outcomes for the betterment of our community," Voelker said. "Even when we disagree about important political and social issues, we shouldn't resort to name-calling."

While acknowledging that the councilman's post was not made in an official capacity, Voelker condemned "the description of any woman in this manner as clearly inconsistent with Richardson's values."

He said he had expressed his concerns to Dunn and hoped that he would express "sincere remorse and a clear understanding of his words' hurtful impact."

Richardson council candidate Mauri Long also weighed in, calling Dunn's remark "inappropriate, demeaning and divisive."

On Friday evening, some Facebook commenters questioned the sincerity of Dunn's apology, and by Saturday morning, his public Facebook page was no longer accessible.

"A qualifying statement is part of a political apology not a sincere one," one respondent had written. Others said Dunn had shown his "true colors."