This is just delusional bait.
<4% of people are vegan in the US. Have you sought out vegan lifters? Unless this is a gimmick of yours, like you run some Youtube channel where you challenge vegans on Bondi Beach, you don't. And a simple google search can find vegans stronger than you including internet personalities like Vegan Gains.
If you are stronger than strong vegan lifters, then you're stronger than almost everyone anyways, and your observation applies to everyone else, even people eating your diet. Long before we even get to the claim that any of this is diet related rather than most-people-don't-lift related.
Finally, I don't believe your numbers. 150lbs at 6'1 is a tiny build, if you can even call it a build. I'd love to see a video of this "physique" lifting anything. When you fib numbers, at least fib something more reasonable like 180-200lbs if you're going to pretend you outlift anyone.