That's what I hate about him, he's such an annoying boy scout. His entire interaction on elbaf was gross. Just everyone gushing over mr.perfect. Only for him to completely dominate flawlessly.
In any other manga we would be rooting for the scrappy, underdog instead of the flawless god venerated by everyone around him.
This wouldn't be the case at all, its a battle shounen most of the time people care for the strong or characters who they think are strong.
One example is The Yonko fandom, or rather WB/Kaido/BM part of it, those 3 characters were introduced as powerhouses so a big reason they have fans is because of their status as powerhouses and in return being powerhouses is a big part of their characters as well, not saying those characters don't have fans due to their other character traits but you get the point.
Even if we exclude the obvious part of Shanks being a powerhouse, people love seeing others fail more than they like to admit because its funny and you can make fun of their fandom as well, so even those who have a neutral opinion on both Shanks and Kid would still take part in the slander.