Tickle the Shooter's Belly/Torso During a Try for A Goal

[Kansas Ref]

I see this a lot and have been calling a "shooting foul".
Players get the point and eventually stop doing it.
Player told me "hey ref I did not hit that shooter".
I replied "You touched his chest/tummy area when he tried for a shot, I just want to see you play defense the normal way--hands extended up to contest it".
He never did it again.
Are you guys calling this a foul or are you letting defenders "slide" on this type of situation?
My partner started calling it when he saw me call it, we spoke during pre-game about these situations and confirmed that we are to be consistent.