What does Jem boast about to Walter, how does scout try to embarrass Jem?

Jem boasts about going up to Boo Radley's house. Scout tries to embarrass Jem by reminding him that he runs past the house everytime he is alone.

Jem seemed to have little fear of Boo Radley now that Walter and I walked beside him. Indeed, Jem grew boastful: “I went all the way up to the house once,” he said to Walter.

“Anybody who went up to the house once oughta not to still run every time he passes it,” I said to the clouds above.