He doesn't seem too phased that she doesn't want to join in. Frankly, not many people have ever taken him up on the offer in the time he's been in Wonderland.

"Well...tradition, I guess," he says. "Back in Pottsfield, they celebrate the Harvest by digging up the skeletons of the departed so they can come join the celebration! But since people come back right away when they die here and we can't really do that I'm just burying random stuff I pulled out of the closet."

It's all totally normal, of course. Wirt even reaches into his bag and pulls out a cheesy skeleton decoration. He drops it in the hole he's standing in and climbs out, moving to start filling the hole back up again.