The difference is that there isn't really another word for band-aid, because "bandage" could mean any kind of wound dressing and not just specifically "a small strip of adhesive bandage with a piece of gauze/dressing in the middle". Band-Aid brand had the market cornered on those for so long that it stuck (ha), I guess. Coke, OTOH, is a specific brand of a product range that has many different generic terms, including terms that existed before Coca Cola.
Band-Aid is understandable because all of them are pretty much the same no matter what the brand is. Soda/pop is different. Coke, Sprite, and Mountain Dew are not all pretty much the same. I woke up to get me a cold Coke. *Drinks Sprite* *Throws logic out of the window* This is kinda silly to argue about but it makes absolutely no sense to a Northerner like myself.
band-aid is generic for any adhesive bandage now. Band-aid goes by band-aid brand. The same is not true for cocacola.
What about Xerox for copy, or Kleenex for tissue? I do agree about Coke though. If I'm drinking a Dr. Pepper, I'm not calling it a Coke.
I love the way Houston appears to be the only city in the country that uses the word feeder I never knew until I left town and got a stupid look when I used the term.
I didn't see it on the list, but the worst is 'SUPPOSABLY'. I immediately assume someone is completely r****ded (for lack of a better word) when 'supposably' comes out of their mouth, other than in a mocking manner. 'IRREGARDLESS' is not very far behind. These two 'words' really grind my gears.