Never denied Zoro feats on this chapter on King, but denying ZKK and that headcannon toxic group put that Zoro can 'one-shot' an YC, but struggling with same one. Nothing wrong about telling those not to believe in headcannon.
I know how you feel, I just avoid doing so, because it's useless to talk to stubborn people, they believe what they believe, true or false, it doesn't matter to them, as long it helps keep them engaged i guess, let them have their fun, otherwise than that, don't hassle yourself