Glad to have found this post! We've noticed this behavior increasing lately, too! Makes me wonder what spring fever will bring... I'm going to try some of your suggestions. I wanted to echo that I think not all of the teasing, name calling and rude behavior is necessarily out of intentional meanness. Have you watched the Disney channel lately? The characters are smart-mouthed and rude to adults, friends, etc. It seems to be an accepted part of culture. However, "not in MY room".
So, onward to watch for teachable moments and restoring sanity to the classroom. Valentine's Day will be a great time to start!