Dearest Demon Overlord, all behaviours have meaning and can be understood. If Capt Brad has an obsessive need to continually belittle you, then it's not too difficult to join the dots and figure it out. He is almost certainly over compensating for his self perceived inadequacies including a lack of confidence in his own authority. If he can belittle you he believes he strengthens himself. Rather like a puffed up strutting bantam cock announcing to the surrounding world that it is "cock of the roost".
He thought he had muted me, but I recently sent him a PM that was quite conciliatory, about the US Navy's truly impressive aircraft carrier, USS Ronald Reagan which is visiting Australia at the moment. ( and you can bet the whores of Queensland have been busy with all those sailors let ashore to "Bouse up their jibs") But the substance of the message, a compliment to the ship, was completely ignored by the oh so wise Capt Brad, who flew into a rant about how he'd muted me & how dare I send him a message etc etc. Most amusing if you can dismiss him as really not that important, which is what I suggest.
And I would also suggest it's better to be muted by Victorious Visigothic Valis, Demon Overlord, than it is to have our own "Michelin Man" ...HR leave a bun in your oven. LoL ( Michelin Man in the cookery awards caper, not tyres )