Hanniballl wrote a post saying that he would not use 'that' or 'who' in that sentence. In attempting to post the message below (in black), I inadvertently deleted Hanniballl's post and replaced it with my own. Unfortunately, I am unable to restore Hanniballl's original post.
My apologies to Hanniballl..
I too would probably omit 'that', certainly in speech. If I used a word, I'd probably use 'that', but 'who' is not unacceptable, in my opinion. Who told you it was?