First they had bowl with a filter and no heater. Then it changed to small tank with filter and heater. Then they said they had a huge tank. When he said they could only take 1, they changed the story to 2 tanks with heaters and filters. He just started laughing and said well which one is it and they said 2 tanks and he was like well that's fine then.
The stupid little boy sold them 2 siamese fighters which we all know were going into the same bowl. I said to him obviously the fluttering of the fake eyelashes clouded your common sense or the orange glow from their faces was so strong it melted the remainder of your brain. I have this problem where I don't think before I speak, I just say it anyway
Personally, I think you were out of order in berating that poor member of staff and if I had been the manager, I'd have been advising you to make any purchases you needed to and to leave the shop.
Of course the guy serving wasn't going to be sneering at the customers he was serving, no matter what you think of the idiot people that come into the shop, it pays to be attentive and non judgemental, especially if you want to keep your job. Doesn't mean he was drooling over them, just means he has a few manners more than most.
As for selling the fighters... he didn't have a choice, if a customer walks into a shop and describes their tank as 3ft with a few neon tetras, good water quality, regular maintenance etc.. would you expect him to refuse a sale? No? Well what if the customer had an unfiltered bowl but had been listening to the advise of other members of staff and realised to get what they want, they would have to lie?
Shop assistants have absolutely NO obligation or right to judge whether someone is lying, if someone purchases a fish and cant provide it with its needs, they are legally responsible and so if people choose to lie... that is their problem. It would be considerably less depressing if there had been an animal protection society but alas... i'm not entirely sure there is!
Consider how depressing it must be for a member of staff selling those fish with no choice, knowing they will probably die.