I am actually the COMPLETE opposite, i dont even understand how you cant answer the phone.
I HAVE to answer everything withheld caller, i cant stand the thought of never knowing who it was that called.
If a friend calls me, and i'm not in the mood to talk, i'll let it ring off, (we dont ever leave voicemails round here) but i will text them straight away pretening i'm in the bath or something and if its important text me it.
But 9 times out of 10 i will always answer my phone.