Oh, because Walmart treats their employees so much better than Amazon, right? You must be really a fan of Walmart if you ain't on their payrolls.
I am not sure if this is the way to respond in a sarcastic way to X. Isn't there a better, more idiomatic way of saying this?
Why do you want to reply sarcastically?
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Jim: Walmart treats their employees much better than Amazon.
Tom: Oh, because Walmart treats their employees so much better than Amazon, right? You must really be really a fan of Walmart if you ain't on their payroll.
Tom's response is a natural way to be sarcastic.
Clive