They usually say things like:
"Hey, we should revive [Momentum]!"
"I wanna you to pls go not thr but her join my clan"
"Your clan isnt very good, man."
Everybody hates the clan and thinks it sucks, right? Well, think about it for a minute. A clan, by definition, is a group of people. And they want it's people. If they want our people then they admit that our people are better than theirs.
The clan technically is the people, and they admit our people are better than theirs.
Therefore they admit their clan sucks more than ours.