There is a splashing sound as Callan presumably tries to go for the meat that was tossed, but no response to the question other than splashing and gross wet slurping noises.

Mizuki can probably assume that Callan doesn't get visitors and doesn't care to receive them, which will back up Livio's story about how the guy simply does not like people. He's free to come by whenever, though! Callan may not like it but I sure do—