Junior High (Middle School): Kids' anxiety over their bodily changes and self-consciousness about their not-a-child, not-a-true-teenager status causes them to direct incredibly hateful, vengeful behavior outward. Their desparate struggle to appear more mature causes a preoccupation with demeaning others in a sexual way. Inexplicably, classmates become "gay" or "whores" or a multitude of other sexually-based names for the most minor of slip-ups, like wearing the "wrong" outfit or sitting at the wrong seat at lunch. (Literally, at my jr. hi. there was a seat that was the designated as the "gay seat". No one sat there.) Because everyone is terrified of being the next target, everyones' eyes are on everyone else. You are constantly under the microscope, and the slightest deviation from pre-determined "coolness" will be all over the school by the end of the day.
High School: Everyone is still staring each other, but teens break off into factions and cliques, because there is strength in numbers. Access to things like cars, new friends, and parties take a little bit of the edge off the microscope. However, woe to the person who doesn't fit into any of their high school's cliques. When you don't fit in with any common group (cool kids, skaters, goths, stoners etc.) you will often end up very lonely. The lonliness and low self-esteem is damaging in a different, and probably more long-lasting way, than middle school's nonsensical name-calling.
slops, gloops, and gruels.