guys, as always just think with context. Prev chapter has proven that already. Killer said Kaido is the strongest pirate while they were heading up towards the rooftop. Then after that, we immediately saw enraged Kaido beating the shit out of the scabbards. People were arguing and doubting he said that line, but official says otherwise.
This chapter is exactly the same. Zoro was mad. Cause of what??
1. Kiku's arm fell from the rooftop. Zoro knew Kaido did this.
2. Zoro was enraged, He said he is tired of playing these games Queen created. He's not here to play around, he's had enough. He's here to cut down Kaido, the strongest in the world.
And finally, we get to see on the final page, Kaido lifted the entire Onigashima.
Now tell me, how could Zoro possibly mocking him in any way in that statement? I dont see anything peculiar in the raws of that particular sentence either.