Here's a solution using List::MoreUtils: 
use List::MoreUtils qw(any);

@diff = map { my $x = $_;
              (any { $x eq $_ } @badstuff) ? () : $x;
            } @badstuff;

[download]
Admittedly it isn't very efficient, but it was kinda fun to write.

In reply to Re: Subtracting Lists by pc88mxer
in thread Subtracting Lists by JimSki

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