Yeah, Kanji knows he's not going to be the best talker, here. He knows that what he says might end up as shouting at this guy just to try and get it through that thick skull - and if he's going to take 'we want to talk' in that way? Tch.
He smiles at Pamela's remark - after all, he fits right in with the 'not quite human' features she's pointing out - but he's just going to make sure the Pokémon are okay, getting out a couple of healing items to pass around to those who've been hit worst.