I'm going to ignore this email that I got.
Why are you ignoring the email?
I want to give you a chance to see how I respond to emails.
Even though you may want to show how you respond to emails, you should respond to them in a timely manner. It is rude to ignore any communication from others.
I'll do what I want.
People write and ask questions and expect to hear back in a reasonable amount of time. Just ignoring them will make people not want to get in contact with you anymore.