Not sure how you came to this conclusion from my post, but it's no different than any other public place except that you may have additional rules to follow. So if knives are a no no where you work then that's easy. If there isn't a policy, then using a knife to complete a task should be done as you would any other task. That is with consideration and respect for those around you without drawing undue negative attention to yourself. When it comes to knives just as other ordinary every day objects, it's how you present it and subsequently use it that says it all. For example, A pen or a chair could be perceived as dangerous if you present it in the right way. I argue, that in most cases you can pull out and deploy your knife, complete an every day type task and have it back in your pocket before anyone notices... and all that with out trying to hide it but rather just using your knife responsibly like you would use any other tool around you which can be summed up as purposefully and without fanfare. Don't make it a larger issue than it has to be.
Now granted, there will be some people who react in a negative way regardless of your actions. But it still comes down to being considerate and having respect for your fellow co-workers... but that's a two way street. In that instance, this would be the perfect opportunity to become a "knifenut ambassador". Bottom line is that a respectful conversation needs to take place in that instance so that all involved parties concerns may be addressed and a mutually agreed upon solution can be reached. Handle it at the lowest level (knifenut to sheep) where possible and if not, get HR involved as needed. Don't run from it, hit it straight on so that you can set the stage for a positive resolution and in the long run make life a little easier for all knifenuts.
So stop hiding in the shadows. Talk to people. Share (don't force) your passions with others. Stop making so many negative assumptions and give people a chance to learn. Otherwise things will only get worse, not better as everyone stays isolated in their own world with only their own preconceived notions and resulting fears.
I suspect hiding the use of your knife is all for nothing most of the time. That person that you are afraid to use your knife in front of may very well have a larger knife than you on their person. You definitely won't see mine until I intend to use it... because I like to have a smooth, sleek and streamlined look with no exposed "hardware"
I'm just sayin', you never know.
) to flash it around the teachers. 
