Occasional disdain, for sure.
But you won't find me criticising the C-17, or the Super Hornet, and you'll find an overall positive impression if you ask about the F-117, B-2, B-52, or B-1B, and even the V-22.
The problem is that anything short of unqualified admiration of all things American seems to count as 'anti-US', and my admiration for US aircraft, programmes, capabilities and personnel is qualified.
We agree that the paucity of RAF assets in Afghanistan is pathetic, but I do not take the word of a para major as being evidence that the RAF is 'utterly, utterly useless' in 'stan.