The textual evidence of Tan's boss's reaction to her English is: "I started writing nonfiction as a freelancer the week after I was told by my former boss that writing was my worst skill and I should hone my talents toward account management."
Textual evidence simply refers to the evidence that supports an assertion that is given in the same text that the assertion or claim is made.
Hence, the textual evidence from "Mother's Tongue" that buttresses Tan's boss' reaction to her English is: "I started writing nonfiction as a freelancer the week after I was told by my former boss that writing was my worst skill and I should hone my talents toward account management.
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