Atari Bass Tabs by Lucky Boys Confusion

This is repeated throughout the song:

G|--------|--------|--------|--------|
D|--------|7777----|--------|7777----|
A|7777----|----3333|7777----|----3333|
E|----3333|--------|----3333|--------|

Except when he says "I don't care"

G|--------|--------|
D|--------|--------|
A|--------|--------|
E|12--5-7-|--------|

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