Why do people say 1v1 me and then back out?

So why do people spam '1v1 me' when they flame you and say 'add me after game' to flame you or something, but then they always back out, why is this?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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