I can kinda understand.
When one character gets feats after feats after feats and looks like second coming of gods and is compared to a character with vastly inferior feats in the name of "rivalry", it can be kinda annoying.
Zoro fans have had that with Sanji, Luffy fans are now having it with Kidd.
Although I must say calling Kidd Luffy's rival is still more valid than calling Sanji Zoro's rival.
When one character gets feats after feats after feats and looks like second coming of gods and is compared to a character with vastly inferior feats in the name of "rivalry", it can be kinda annoying.
Zoro fans have had that with Sanji, Luffy fans are now having it with Kidd.
Although I must say calling Kidd Luffy's rival is still more valid than calling Sanji Zoro's rival.
You know my point of view, you know i think Kid is still in rivalery with Luffy and i am pretty sure this will stick for a longer time. But thats just my opinion and point of view, nobody needs to share it.