Thats pretty immature sending you a pm about it considering hes 30!
But...
What i will say hes not a douche for playing with nerf guns, i personally hate them along with paintball and laser tag but each to their own.
I know grown men who still collect and play with hornby train sets and others who are really into RC car racing which doesnt appeal to me in the slightest but if thats what they like then so be it, i wont judge them because of it.
If they did it in a gimp costume though then that would be wrong