It's mainly pro-templars who say this.
Hah, I'm hardly pro-Templar.
But Solas disapproves is the new reaction image being used (particularly with his I HATE TEA scowling), like Morrigan disapproves. Or "No."
It has little to do with how often it's used, and more in the funniness inherent in the image. Sten only said No once, but it was enough to move the hearts of many. Same with the Arishok.
....I'm still disappointed that we didn't get to see the Stenishok leading a fleet of Qunari dreadnoughts with a box of kittens under one arm and a box of cookies under the other, where he looks to the camera and says "No.", as the ending to Inquisition.
Missed opportunity there.