Any ad which offers a toy when I sign up. Why anybody would choose their car insurance based on whether they get a stuffed meerkat or a toy robot is beyond me, and the implication that I would be swayed in this way is insulting.
Ads which are badly dubbed. If you can't be bothered, or don't think it's worth it, to invest the time and money in an ad which is appropriate to the language and culture of the country in which you're broadcasting it, don't expect me to pay attention.
Ads with children's voices played by adults putting on a phoney child's voice. It sounds annoying and is pointless.
Ads which are considerably louder than the programme during which they are being broadcast. If you make me reach for the remote then you're causing me an inconvenience and I will never buy your product.
Ads which make fun of groups of people such as ads for cleaning products in which the man is clueless about how to clean a house and needs the woman to show him how to use this great new easy product. The implication that poor stupid dirty knuckle dragging man needs clever homely obedient woman to understand the basic concept of cleanliness is offensive to pretty much everyone.
Ads for perfume or aftershave which have no discernible message other than "use this aftershave and you'll become a buff sailor and women will be attracted to you" or "use this perfume and you'll become a beautiful woman and men will be attracted to you"
I must confess I was confused as to why companies seemed to be wanting to do that. An earlier example seemed to be that knitted monkey with the teabags.
Chalk it up as another in the long list of things I failed to understand about how people work.
I occasionally spend time in other countries and with the lag that the UK has on such things I would see the UK versions when I got back. That was about as close as that gets to messing with my head. Exception being a sweet advert I saw once where the kids and grownups were role reversed and dubbed badly. Not good.
Leave the loudness alone -- it is very useful for advert detection for DVRs.
Diet commercials seem to be the more obnoxious version of that for me.
Yeah I can't wait until 3d... printers us plebs can use deal better with volatile organics (they already exist for pharmaceuticals and possibly plastics). Then again I have been able to buy a perfectly functional shirt made by some child slave in Bangladesh for decades at this point and people still spend silly money for the exact same cotton* that some designer had sent to a screen printer/dyer.
*I say that but one of the more interesting fallouts from fashion not being as covered by copyright/IP law (it is pretty much whatever you might squeak out of registered designs, design right, trademarks if you incorporate your trademarked logo into the design -- that sparkly encrusted letter/logo form bag clasp or hinges of your glasses has as much to do with IP law as it does to do with art, probably more) was fashion designers occasionally using higher quality materials and designs that would mechanically fail if built using cheaper ones.
Also amusing to me was I did not self censor any of that -- I might have remembered the actions but did not remember the brands.