There is never a reason for either party to escalate a verbal disagreement to a physical one, but I would be very shocked if the PDA were as innocent as they imply it was for someone to walk out from behind the counter and calmly ask them to knock it off. There are always two sides to every altercation, and even his description, “kind of briefly - we began to kiss” sounds like downplaying the degree of the kissing going on. It sounds like there was a good chance that it was a pretty excessive makeout session. They really seem to want to make it a homophobia thing, and maybe it was… whether the employees’ line for excessive would have been the same for a straight couple as for this gay one, I don’t know. But I wouldn’t be shocked if the request was at least arguably reasonable for a business that doesn’t need people sucking face at the counter. Or maybe I’m wrong and the entire restaurant staff in left-leaning Washington DC are just a bunch of homophobes. Idk.