Is this metaphorical?

Your incomplete sentence with emphasis on the fact that a person is involved makes me wonder. What did he actually do?

Normally 'kradsende' would be translated with 'scratchy' and a 'scratchy sound' would be interference from scratches on a gramophone record or LP or possibly atmospherics on the radio, or something like that.

But a scratchy echo or resonance somehow seems a little odd.

On the other hand kradsende could well be used figuratively about an architect being annoyed at his work being criticised, for instance.
'A sharp retort'
disgruntled?
petulant response,
huffy, querulant?

Just another angle of approach - I may be completely off track.