Yes, you are a liar. You said "ruined" but still have not provided an example of something they have ruined. And after being called out on it, you proceed to use personal insults. Not only are you a liar, you are also incredibly immature.
It's always nice to see the exact moment someone realizes they're in an argument that they can't win. And it's no surprise it's due to making a claim you have no way of backing up (because it's factually incorrect).
do you know why they protested at stonehenge? the comic actually illustrates it well. If you're this pissed off about cornflour being thrown on a UNESCO World Heritage site, you should look up how many world heritage sites are at risk of being submerged.