It is never ok to take something from somebody emotionally because you lack it. If somebody is confident and you aren't you don't get to bring them down. If somebody is happy you don't get to make them upset because you are. Having confidence and feeling happy are hard things to do sometimes and it takes time to feel that way so never EVER snatch that away from somebody its just not fair.
It has come to my attention that a lot of people haven’t played this game so pay attention:
Grab a friend and tie your hands as the following picture shows
Now try getting yourselves free well maybe not free but apart from each other, so that the ropes aren’t tangled together, without opening the knots or otherwise removing the rope from around your wrists. It is possible.