Congratulations on the flame! No that just doesn't sound right does it? Usually one avoids flames in real life as well as the cyberworld.
My .02 worth, not sure if anyone said this or not, but this is my solution. If and when you find out who it is, don't take revenge, life is too short for thar BS. No you start by bringing smaller pocket/pen knives into the office, and use them around the person, when you can, nothing threatening. Then as the person gets used to seeing you with a "non-lethal" knife, start to share with them some facts about the knife/knives you are using, like "hey. did you know that this knife is almost 100 years old and going strong. . . This type of knife a .... was first made to do ..... just small things and do be helpful this non-knife knut needs to be eased in ;-).
Then after this goes on for a while, start talking about why and how you collect, as a natural extention of the conversation while you are using your knife. If the person starts to show interest, foster it, make it grow! What you want to do is educate this one person to see that knives are not BAD and knife owners/carriers are not BAD/SCARY people. Let him or her know how much knives can cost, like "this knife cost me $3.00 when I was young, but in this condition at this time I can sell it for $50" Or "you know most pocketknives are inexpensive, and most people do have a use for one sometimes, if you had one you wouldn't have to ask me to open packages all the time for you. They can be expensive too, I have a ...... that cost me $...... and saw a ..... for $..... I would love to own, but can't afford." As the person gets used to you using knives around them, you can start to bring different knives with you, until you can bring and show and use your usual daily carry knife without the reaction you got previously.
So I say educate him/her make them aware what knives are and can be. You might turn them into a knife knut!
I know that seems like a long hard process to just educate one person about knives, you can modify this anyway you want to, bottom line this person has been conditioned in one way or other to fear knives, esp. one that is "scary" to them, or maybe just had a bad experience with one, mugging etc. Show him/her that all knives are not the same, as all knife persons are not the same.
Make him or her an ally. That is the best revenge.
Peace
Paul