Statement in response to being told that your work sucks, or you suck in general. Often said in defense of one's self when being accused of sucking by people of limited knowledge or bad information. Commonly stated in a rushed together pronunciation "idontsuckyousuck" for maximum impact, and to point out that the person doing the accusing actually sucks, not you.

It is a term used when something bad happens to someone else.

The ultimate mean-spirited put down
Used only when the gloves come off
Common usage is the term in tandem with a belittling a team that “You” support
Can be preceded by other “things” about being "You" that sucks

A phrase uttered to allow the person receiving it that you don't give a shit about their problems.

when something bad happened to another person, it sucks to be that person

What you say when someone has dissapointed you over and over, and there is nothing else to explain how you feel

Phrase used to express an indifferent sympathy.