Someone who seems to delight in making others as miserable as they are; who is annoyed when they see others happier than they are; who seem to be hell-bent on upsetting people who have positive attitudes and seem to enjoy making others sad -- these people are Joy Robbers.
A Joy Robber could be co-worker habitually shoots back negative retorts to counter your positive remarks. Or a boss seems to always say something to put you on the defensive just when your day is going well. A boyfriend, a family member, someone you know seems to always bring you down in a seemingly intentional way. It almost seems like these people have an agenda and that is to rob others of their joy. However, my personal phillosophy is I REFUSE to allow others to rob me of my joy!