It's not appalling. It would be appalling if he dropped his trousers and mooned in full view of the BBC News Channel, but he didn't.
He simply had the gall to walk around his place of work wearing casual attire - something which is commonplace in workplaces up and down the land in 2020. I am sat at my desk wearing a grey hoodie right now in actual fact.
It may not be to your taste, and that's fine. But let's keep things in perspective and not go overboard.
I meant if he arrived at work wearing the hoodie, then fine. If he wanted to continue to wear it, he should have stayed in the top floor of Broadcasting House. If he had to go downstairs to the newsroom, where the general public can see you, he should have worn something more appropriate. I'm not saying full suit and tie but something not as 'just got in from the gym.'
Your currently wearing a grey hoodie that's fine - unless I'm mistaken, your not sitting in the background of the BBC News Channel . But if your working in front of the public, you should dress smartly. You wouldn't expect to go shopping in Tesco and see the checkout staff wearing grey hoodies, would you?