I've got a few :-
Diamonds. Forget the bullshit marketing, a diamond isn't forever- and you're certainly not. It's an overpriced 'precious stone', and the price is far more than it should be because of a sleazy cartel known as de Beers. Then you've got 'blood diamonds'- money off the diamond industry finances a lot of civil war and assorted violence. Most often, you don't know where the diamond you buy comes from. Coloured gemstones, no problem. I think they look better anyway.
Sharks fin soup. I'm a happy carnivore, and I've got no problem eating sharks fin soup as such. What I don't like is that they just lop the sharks fins off, then throw it back into the water to slowly drown. What a waste- and the heavy demand for sharks fin, from the Chinese in particular, is having a major effect on the ecosystems of reefs. I also wouldn't buy tiger penis, bear bile, monkey brain or any endangered species. Living in HK, this got me a few funny looks- sharks fin soup is almost 'de rigeur' for a Chinese banquet, and it can be construed as a loss of face for the host. Screw him- he shouldn't be buying the stuff either. I hate the Chinese habit of eating rare animals.
Champagne. I don't particularly like the stuff, and in particular I don't like the pretentious knobbery that surrounds it. And it's stoopidly overpriced. If I must buy a sparkling wine for an occasion, I make sure it is not an appelation 'Champagne'.
Ivory. No way. Why kill such a magnificent animal just for it's tusks? Obscene.
T shirts just featuring a designer logo- knobbish. Why should I advertise some French or Italian pooves Logo, and look like a knob at the same time? And I don't care if it's 'fake' or 'real'.
Fashion or Trendy mobile phones. If I was still in the biz world I'd need a better mobile, with Email and basic spreadsheet & database capacities. But thats business. A mobile phone ain't a fashion item, it's just a bloody portable phone. The way meagrely paid office workers here (all thru' Asia too ) save their pennies to buy the latest trendy phone just makes me shake my head- I mean it will be old hat in 18 months, and then you have to buy a new one to keep up with the Somchai's & Wongs. Not to mention that plenty of people want to steal that trendy phone. Few would be bothered nicking mine, 'cus I just keep them until they're totally screwed, and then buy another cheapo. If I lose it, big deal.
Mothers/Fathers/Valentines day cards- Marketing gimmics with obscene mark-ups. Nothing traditional about them. These days, I don't even send birthday & Xmas cards either. And flowers on Valentines or Mums day? No way. If I miss them that much I can always call, if I want to treat someone I can take them for a meal.
Faux or surplus military gear. I've been a military officer. War ain't fun, war ain't glamorous and trying to look like Rambo sure isn't glamorous either. And if you think dressing like a soldier somehow makes you more of a 'man', try penis enlargement. Would a real soldier wander about in combat fatigues when he's off base and off duty? Only if he's a Knob.
How about yourself?