I could just imagine people saying "Is that a KNIFE!!!". And freaking out.
I don't have any problem pulling out a knife in front of strangers if I need to cut something, and I don't care if people see my knives on me where I am carrying them because I can't help that, but I would be reluctant to pull out a knife and openly display it on a table in front of me out in public. It seems like an unnecessary way to attract unwanted knife attention.