Vegans were banned from a pub during a Boxing Day hunt, leading to a backlash on social media.
Some people accused The Dorset pub in Lewes, East Sussex, of being "discriminatory".
Harvey's, the brewery which owns The Dorset, said it was "appalled", and an employee had been suspended over the "inappropriate" sign.
Sussex Police were called when scuffles broke out between those taking part in the hunt and protesters.
According to its menu, the pub in Malling Street caters for vegan and gluten-free customers, and it was only during the hunt when the sign appeared in the window.
On Twitter, Gilly Smith said: "Isolating and discriminating against their own customers? Really clever marketing ploy. Should be ashamed of themselves and boycotted."
Why bother being in the hospitality business if you're going to discriminate against the fastest growing market? What a stupid thing to do! Cutting their own throat somewhat!— Not quite an Angel (@Angel_Kershaw) December 27, 2018
A spokesman for Harvey's said: "Following the comments generated by [the] inaccurate, insensitive and inappropriate poster, the company would like to issue a formal apology for any confusion, offence or upset it may have caused.
"Harvey's do not concur with the sentiment of this sign in any way, and are appalled at the inconsiderate actions of the individual in question... [an] employee has been suspended pending an ongoing investigation.
"Harvey's are fully committed to the inclusivity of all guests. We... would like to reassure current and future patrons that all are welcome in our establishments. This will not happen again."
@Harveys1790— Nutkin (@Nutkin_GQWP) December 26, 2018
Thanks for banning me from your pub. All because of what I choose to eat?!
The England and Wales hunting ban came into force in 2005 and saw the practice change to drag hunting, in which hounds and riders follow an artificial scent.
Hunts remain controversial and violent clashes with protesters were seen elsewhere on Boxing Day.
The Dorset pub deactivated its Facebook page after the photo was shared more than 100 times.