They are salty about the way Loda treated Lucci against casual Zori, they though Zori need extreme diff fight to fight G5, fact is Zori put same effort than G5 against Lucci but the damage is real
The thing is, Zoro having far bigger AP than Luffy means Lolda's writing of the YC1s winning against their Yonko on one stat held true.
Marco has his regen, can survive what even WB couldn't.
Katakuri has his FS, can react to what even BM couldn't.
King has his durability, can no sell what even Kaido couldn't.
Pretty sure Benn and Shiryu will have this, too.
So, Zoro being able to easily kill what Luffy couldn't is consistent with this portrayal. He nearly killed Kaido if it weren't for BM and it took him one named attack to stop Lucci.
I don't get what Luffy fans are crying about. Makes them look petty ngl.