I'm not sure what you don't understand, but I'll try to help with some vocabulary: 1) to be quick to means to do something immediately; dismiss means to "throw out"; rumors are things we hear that may or may not be true; ridiculous means "laughable", as in far from the truth; 2 ) here, ridiculous means "unreasonable". I hope this helps. Let me know if I've overlooked something that you don't understand.
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