Nobody likes anyone who says "I told you so".
But for some reason nowadays, people are very reluctant to give credit to anyone else. Everybody's trying to get credit for themselves, I guess. Nobody is going to say "You were right!" even if you were.
Even if you were right about very, very important issues that affect trillion dollar markets and people in every part of the world. Even if you could have saved lives if you had been heeded. Even if you were telling people cannabis can cure cancer for 10 years, while the mainstream is still barely starting to catch up. How many died because of that delay? How many suffered, and still suffer?
So it's important for you to say "I was right" sometimes.