That is just not true. Nonnies have confidently stated that actually rejecting is the best way to do it because then the gifter will match with someone else. That implicitly assumes the gifter is gaming away from the giftee. In either scenario, two people are incompatible. The main change is that the giftee is able to dodge ever having to articulate their preference, which as I've said is silly and mostly a demonstration that they aren't suited for exchanges.