Often, you will find that there are those who gossip with the hope that you may respond and provide information. In fact, you would be surprised how many times people engage on a "fishing expedition" in the "hunt" for information that can be used to cause hurt to others.
There are those who thrive on the misery of those they dislike. Malicious gossip is a means to cause misery and unhappiness to others. Seems to be what the world thrives on these days given what one sees in the media!
Regards.