The cheek of it. We’re one of the 11 founding members of the football association, and the only ones still playing professionally.
Have some respect for your elders. And indeed betters.
No you aren't.
If you are claiming that you are the oldest club because another outfit called Crystal Palace (absolutely no fucking relation to your club - which was Founded 1905) played on the original Crystal Palace grounds back in the day, then you are screwed.
Because on the same basis Sheffield United can take their claim back to 1857 when a club called Sheffield were formed and later started playing their games at Bramall Lane. Of course there is no relationship between Sheffield and Sheffield Utd, just as there is no relation between the present Crystal Palace and the one than had been dead about 20 years.
By the way, I have every single Millwall home programme between Millwall and Palace in the Southern and Football Leagues since 1910. (I'm afraid my oldest Palace programmes only dates back to when you played at The Nest. You know, the former home of Croydon Common. Who were around nearly a decade before your club was.)
Now, Millwall would like to write up and celebrate their opponents' ancient history, if they had one. Guess what when we played Palace: not a squeak. Not a dickie bird. No tales of great days of old and Crystal Palace (1905) reaching the FA Cup semi-finals.
Why? Because the people around at the time of your club's formation knew they had absolutely fuck all to do with the original amateur club of yore. A different entity altogether.
So do just pipe down. You are making an even bigger arse of yourself than you normally manage.
The fact a (suit-wearing) Millwall supporter knows more about your club's (true) history than you do really must be about as bad for you as it gets .