Depends on the context. If you're (as I suspect) talking about not liking playing with Nerf guns yourself or not appreciating people using them around in you a professional environment, not at all. If you're walking around complaining about children playing with Nerf guns, maybe just a little.
Nerf guns in the office is the worst, I don't understand what's the obsession with nerf guns in "start-up"s. It's incredibly distracting and sometimes dangerous, everybody just abuses it and list it as a "perk" to attract frat boys to work for their company.
At home? I have a cat that loves chasing nerf darts. I'd raise an eyebrow with you if you questioned my owning one or two. It's just too damn funny to watch the cat go nuts and then look at me like I'm the bad guy when the dart stops moving.
