Or you post a player, say you're looking for prospects only, and you get offered three old farts making zillions.
Or you reject the players offered and you get an angry TC telling you your player isn't that good anyways, and you're an idiot for rejecting said offer, to which I usually counter, then why were you willing to deal your three "studs" for my "lousy" player? Never get a response to that one.
Or they try and frame it like they are doing you a huge favor with their lousy offer, something along the lines of "I see you are in rebuild, i will send you these three young, fringe MLers, for your best prospect, this will give you a good start on the future" or "You look to be a contender, here take these old, expensive, marginal (with a crappy prospect) guys I don't want, and I will take your best player from you."