-anything with unnecessary proprietary shit. (Why I hate Apple)
-all of those copycat and kickstarter microcontroller crap. I mean, arduino is totally overhyped, but at least they make many different modules for it, unlike all those special little flowers that go "bing bong" when you turn them on. Raspberry Pi might be ok but I've never tried it.
-scam/useless products on TV, mainly health related (weightloss crap, excercise belts, water pumps for your nose, fitbits, UV/infrared pain relievers). Theres other crap products too, but they're harmless. Its when they might do weird stuff to your body...
-video advertisements in supermarkets, especially motion sensor ones, annoying waste of electronics that startle you. (It's fun to find their power button or memory chip and kill them
just leave the chip in the aisle somewhere) I preffer plain automatic coupon dispensors with a simple blinking light.
-electronic price tags (little LCD panels on the shelves), we have one clothing store here (peebles?) that has them on everything. They are disgusting because alot of them have broken screens (from people smacking into them with carts and stuff) or dead batteries, so you don't know the prices of things, or even if it's on sale.