I don't think there's an easy answer. Twits like that will always be twits, unless they see something worthwhile done by you/your brigade.
The attitude (at least of those I've run in to who think like that), is generally born from an ignorance of what the CFS does. I don't bother trying to change their attitude anymore. Of the times they've asked what we do and I run off a list of jobs, they ask 'Why the f would you want to do that?' No community spirit, only worried about themselves.
Good on you for sticking it out in such a scheiße of a work place. Personally, I'd be keeping an eye out for a job elsewhere, but I've no idea about your situation.