I'd say that the statement " I mean there are 25 year olds who have no idea who Chaz is" is a better reason to object to Chaz being on DWTS than the gender change.
I am 31 and had no idea who Chaz/Chastity Bono was until the show. Of course I did know who Sonny and Cher are.
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The way to gain a good reputation, is to endeavor to be what you desire to appear. - Socrates