I define bad gift as a gift that was purchased because it was cheap, not because it would be a good gift for me. When I was smaller, I of course resisted clothes, but that's because I had basic pattern recognition skills and could remember every time I received new clothes when it was NOT Christmas, and assume that my relatives were cheaping out and getting me things I was going to receive anyway. Now I treasure clothes I receive for Christmas because finding pants/shoes in my size is either impossibly difficult or ludicrously expensive.
I also detest 'implication' gifts. Like the rake someone else mentioned. "Oh, so for Christmas, you got me a job. Thanks." I also remember seeing a TV show where this woman was anorexic (IDK what kind, the kind where you eat all the time), so she was pretty hefty. What does she get for Christmas and her birthday? Coupons for gyms/Jenny Craig. That's pretty shitty.
Worst gift I've ever received though -- I got this blue fleece thing one year. It wasn't that I didn't wear fleeces, or was allergic to them or anything -- the problem was that in order to get around the embarrassment of my family having to take it on the chin financially from both my parents losing their jobs, we suggested a gift rotation thing -- I forget what it's called, everyone puts names in a hat, and whoever you pull out is who you buy the gift for -- and everything (like the fleece) that my uncle's immediately family gave to everyone else had the distinct odor of them all passing their gift-buying duties to my aunt and letting her do it. Way to support us, ya cockbags. I was especially pissed because I busted my ass on research to find out what to get my paternal grandfather.