It's obvious why they are getting flustered, AMD do not support from what we know dx12 on as many previous generations as Nvidia. For some strange reason they feel the need to defend AMD by trashing Nvidia for this.
No I feel the need to defend a smart move from AMD not to support GPU line up that wouldn't have a good enough experience running a DX12 game.
What is the point? Lets support a HD 4950 but good look running BF6 in DX12 lol