[econjack]

My pet peeve: improper use of "that" instead of "who". Example:

He was the man that robbed the store.

It should be:

He was the man who robbed the store.

I hear this one butchered fairly regularly on the evening news.

[luvbach1]

How do you like “I could care less” when the speaker means he couldn’t care less?

[Mollypitcher1]

My pet peeve: improper use of “that” instead of “who”. Example:

He was the man that robbed the store.

It should be:

He was the man who robbed the store.

I hear this one butchered fairly regularly on the evening news.

I TOTALLY agree. It is one of my pet peeves as well.

[treetopsandroofs]

“My pet peeve: improper use of “that” instead of “who”. Example:
He was the man that robbed the store.”

Again FWIW, this explains it the way I learned it 35+ years ago....

It is entirely acceptable to write either the man that wanted to talk to you, or the man who wanted to talk to you (3). [emphasis added] - See more at: http://www.quickanddirtytips.com/education/grammar/who-versus-that#sthash.PJOO46YJ.dpuf

Source:
http://www.quickanddirtytips.com/education/grammar/who-versus-that