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#05AB1E, 7 6 4 bytes

Code:

lIl-

Explanation:

l     # Convert the first character to lower case
 I    # Get the second line of input
  l   # Convert the second line of input to lower case
   -  # Loop over the second line of text and substract each char from the first input
        For example: "abcde""ba"- would result in "cde"

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Truthy is when the current letter is outputted. Falsy is when nothing is outputted.