Is it true that pretty much everyone talks about everyone behind their backs?

I have caught evidence of it, it's soooooo emotionally painfull when my son's babysitter and her daughter was so nice to my face, and the babysitter called my moms friend whos also her friend on the phone, and I picked up the other extension in my mommy's room on the other line, and heard her trash talk me and my mom like crazy, it was so weard, and the other friend on the other line agreed