What is Security for at the airport?

Going through TSA and family of 5 putting on there shoes directly as you walk through the scanner. TSA yelling to move. I also ask "can you move up?" Dude turns around literally screaming in my face to "don't telte.e what to do. You need to be kind to me" all while touching my nose with his at full screaming volume.

Security? I asked for assistance, they literally said " Not my job". So waht, they are checking for water bottle stuffed up and ass? The scanner does that.

Worthless as rent a pigs.