Cask Marque posted a tweet, which has now been removed, that showed an image of Robinsons Brewery's Dizzy Blonde beer.
The image was the logo of the beer alongside a woman in a red dress and high heels.
The post said: "What do you think of our latest #beeroftheweek?" and mentioned Robinsons Brewery in it.
A Twitter user, Arcadia Bar tweeted the original post, which has now been taken down by Cask Marque.
One Twitter user slammed Cask Marque.
Another said the marketing was "lame".
Ladies That Beer criticised the organisation for removing the tweet.
Cask Marque has now responded on Twitter and apologised for any offence caused.
Cask Marque director Paul Nunny told The Morning Advertiser: “Our social media employee wasn’t aware of the conversations about sexist branding on beer and tweeted about a beer of the week for which they had tasting notes.
“Once we saw the mistake we removed the tweet and we would emphasise our commitment to equal opportunities and in particular branding beer appropriately.”
The Morning Advertiser contacted Robinsons Brewery but had not received a response by the time this story was published.