@Jogger007
If someone makes fun of me, I compliment myself out loud, so everyone can hear it. Practice every now and then ... have a few compliments lined up. Same works for your friend. If someone makes fun of her, counter it with an out of this world compliment about how amazing she is. Trust me, she won't remember those assholes making fun of her, she'll just remember her confident prince charming and how sweet he is.
Throwing insults back and fourth just makes everyone angry and feeling shitty. When the world throws something negative at you, counter it with something positive. The world will be a better, brighter, happier place.
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If this is a repeat issue with the same bully over and over again, see this guide on how to deal with an IMVU bully, permanently :
viewtopic.php?f=2&t=1395&hilit=bullyAlso, here is a tool for muting a bully in chat if you just want to ignore them:
viewtopic.php?f=179&t=8013&hilit=+IMVULite