This site loves twinks, what are you talking about? Only here will you find people fawning over Troye Sivan and the guys from Years & Years.
And Shawn Mendes is not a twink. He's about as buff as Bieber now.
Sorry to burst your bubble but this guy is a twink. Most of the other gays who saw him in person would call him a twink. He's defined but not muscular. He needs to gain about 10lbs of muscle before he can move to the twonk category.