Hard Pill to Swallow

Max excitedly shows Moon a baseball card he traded for, believing it's valuable. Moon reveals it's a fake, leading to a discussion about the idiom 'a hard pill to swallow'. The phrase's origin is explained, highlighting acceptance of difficult truths. Max humorously suggests a creative solution to his disappointment.

What is the significance of the phrase 'it's just an old card with the new guy's face taped onto it'?

How does the character plan to deal with the situation regarding the card?