i think everybody knows how it feels to be teased or looked down upon in some way at some point.

so...

why do people do it to others?

it helps them feel better about themself. because they get to count as part of the 'in' or 'desirable' group and part of it is... relief. relief about that.

i think that is sometimes why people who are picked on most (ie kids who are bullied at home) can often go on to be the worst offenders themseves (bullying kids at school).

i think there is also a point that we DO notice difference. to notice is normal.

but...

i think we are a little afraid of difference too.

fear.

i think that is why.