Seemingly no apparent reason is the key here. If Dunbar really showed up and said, "I'm going to be a dick, NO!" then sure, I'd be up in arms too. It makes no sense though, unless your old rep was breaking the rules left and right and maybe giving a "friend" discount as well and Dunbar wants to do things by the book. Maybe Dunbar is in cahoots with a local business that wants to eliminate the competition, I don't know. I'm loathe to take a side when I don't know and the only evidence I have is a bleeding heart diatribe.
I generally side with the little guy but in this case your story makes little sense.
tldr - more explanation on the "retail environment" thing without going off on how much you've invested in the place would be helpful.
The shop it'self doesn't serve beer, the public house which is attached to it does, and the old shop was the same, attached to a pub, there is no difference, so I can only assume there is nothing more to it than I have said.
It is the shop owners livelihood, and he is stating the effect it has had on his life, not sure how he is purely trying to appeal to emotion? we are trying to get our shop back, if you lost your job for seemingly no apparent reason, i'm sure you would have something to say about it. And your local game shop for that matter.
the fact you rolled your eyes kinda sucks, but each to there own about what you sympathise about I guess.
If there is more to it, then I am completely unaware and am just going off of the information I have,
So is it because the shop serves beer? I don't have a problem with that but that seems to be the conjecture on reddit. If true, you should lay it out there as the reason.
The owner that he does himself a disservice by trying to purely appeal to emotion. I read that tripe and I rolled my eyes. If this is the whole story, then Dunbar is an idiot. I have a feeling there is more to this though. A sales rep wouldn't reduce his sales by his own actions without good cause.