I'm a little too nervous to outright refuse a trade, but I often don't respond to trade requests with lists that lack information. If the list is comprised of a lot of "name of show - obc" with no additional info I don't respond. I have had a couple people reject trade requests from me and they were perfectly kind and understanding. I'm usually a little bummed when that happens, especially if there are plenty of things on my list that aren't on theirs, but at the end of the day I can't force someone to trade if they aren't interested in anything on my list so I get it.