Lydia Cawson said her and partner Rubyyy Jones, who define themselves as a 'queer' couple, were in Canteen on South Bank when the incident happened.
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According to Lydia, she put her arm around Rubyyy and gave her a ‘peck on the lips’, when they were approached and told to stop.
Speaking to London Live, Lydia said: “I didn’t notice any adverse reaction in the restaurant, myself. Then the lady came over to us and said ‘can you stop what you’re doing please, this is a family restaurant’.”
But Rubyyy challenged the member of staff, asking: “Is it a family restaurant or is it a homophobic restaurant?”
While the waitress denied the homophobia claims, she told the couple to sit apart from one another.
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Lydia continued: “The first thing is that we were really shocked by this challenge.
“We didn’t feel like we were overly affectionate. Yes, it was an intimate moment, but consoling her and just a simple loving reaction.
“The second comment was that it was a family restaurant and it made me feel; ‘why does that matter? Is it because children are present – not that there were any children present at the time – anyway, why should it matter if it is a family restaurant?”
A spokesperson for the restaurant confirmed an investigation has been launched.