Genghis Khan's actions are widely documented, so you can make an informed opinion on him, which in turn would be fair
Your opinion that Neville is the worst Everton Captain of all time is not an informed one because you clearly don't know enough about previous captains to make the argument and form the opinion. Regardless of this, you are presenting it as an absolute fact, which it isn't. If you went away and read match reports, watched the footage of the Everton Captains that we have and properly researched this matter, then I wouldn't be taking umbridge with it. You haven't though, so I'm calling you on it. You can't declare Phil Neville as the worst Everton Captain of all time, and essentially slander him, when you haven't properly researched it.
I'm not even a massive fan of Phil Neville. I wouldn't really mind if someone said he was the Worst Captain of the past 30 years or anything like that. But to say he's the worst ever? You better have some actual solid facts to back that argument up or I'm going to challenge it, because we're talking over a century of the clubs history and I don't think it's fair to just declare that Phil Neville is the worst captain that a more than 100 year old football club has ever had without some small smidgen of active comparison between him and his predecessors.
You may claim that it is just your opinion, but I am declaring that your opinion is invalid until you have shown your working, which you are refusing to do, hence your opinion has no value. The onus is on you to prove that it does
One Sky Sports interview, that he apologised for practically straight after, does not constitute enough evidence that he is the worst captain ever. Does it constitute that he was the worst in recent history? Maybe it does. But of all time? No way, not even close.