In the early Peanuts comics, Charlie Brown is not always the nice guy everyone walks over. Two examples:
Snoopy fairly early on has behavior beyond standard dog behavior:
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Looks like Charlie Brown’s shirt color wasn’t written in stone in the early days (although it also looks like “red cup” was not written in stone on that particular day).
Weekday strips weren’t color in the 1950s. The random colors were witless additions much later.
Red cup? Blue cup? Apparently the illiteracy of comic strip colourists has a long history.
Charlie’s response here doesn’t seem unearned. Classic slapstick situation.
Well, in the very first strip a kid said “How I hate him!” Maybe that hatred was earned.
Characters evolved greatly over time, along with Schulz’s graphic style. Charlie Brown and friends were introduced as “typical” and “mischievous” little kids, some preverbal toddlers. Charlie Brown’s proclivity for failure and anxiety, Lucy’s meanness, Snoopy’s eccentric fantasy life … all took time to emerge, along with the strip’s singular mix of genuine kid stuff with adult sensibilities.
Comics I Don't Understand 
Looks like Charlie Brown’s shirt color wasn’t written in stone in the early days (although it also looks like “red cup” was not written in stone on that particular day).
Weekday strips weren’t color in the 1950s. The random colors were witless additions much later.
Red cup? Blue cup? Apparently the illiteracy of comic strip colourists has a long history.
Charlie’s response here doesn’t seem unearned. Classic slapstick situation.
Well, in the very first strip a kid said “How I hate him!” Maybe that hatred was earned.
Characters evolved greatly over time, along with Schulz’s graphic style. Charlie Brown and friends were introduced as “typical” and “mischievous” little kids, some preverbal toddlers. Charlie Brown’s proclivity for failure and anxiety, Lucy’s meanness, Snoopy’s eccentric fantasy life … all took time to emerge, along with the strip’s singular mix of genuine kid stuff with adult sensibilities.