Last time I was in a GW shop, I entered to buy green putty.
The clerk came straight to me before I even could take a relaxed view of the shop to offer me a new WH40k box-game just released.
I said: "I'd like just some green stuff, please", and the guy started the typical question battery "what do you play, what army, etc".
Then I said: " I don't play Warhammer", just that, and the guy was looking at me as if reality was falling down around apart...

LOL ... his face was: "it can't be!! a guy that doesn't play WH??? in this shop??"...
After his initial shock he resumed offering and showing me WH and WH40k figures and stuff I was not going to buy and had NO interest, instead of asking me about green stuff, modeling tools, etc...

I don't say them I play WM, because it's time wasted too

I don't blame the retail guys - they are only doing what they are told.
Right, man...