[fnordfnordfnord]

Yeah and it was pretty common to be voted down and called a crank over it too.

[pessimizer]

Hence, "greybeard." Even when people are talking about something that they know to be true, they ground themselves in derogatory stereotypes about the people who were right.

[jerkstate]

Do you consider “greybeard” to be a derogatory stereotype? I sure don’t..

[20after4]

I've seen it used with either positive or negative connotations depending on the context.