A messages B. B can see this message. A then blocks B. B cannot see the message now. This is what you want? If B wanted to report A, now they cannot access any evidence...
Snarky message and immediate block

well that's weird, but chess.com doesn't ban anyone for cheating unless they're 100% sure. They aim to reduce false positives. So if you weren't just copying the computer's moves, you'll be fine.
Most people who accuse others of cheating are bad at recognizing cheating.
Even some 2000s suck at detecting cheaters tho they all block me and I almost never get snarky messages like that after like it's a good thing if they block you you don't have to play with them again
It's really sad how about of people accuse each other of cheating just because they can't tell what it is or if they can tell they can't tell what is not cheating
Dear mods,
If someone sends you a message accusing of being a cheat and immediately blocks you, why do you see it? If you can't respond, you shouldn't get that message. Fix this.