The turbulence from the airstone or bubble wall goes straight up. It does not spread out until it hits the surface. Unless you have a fish like Siamese fighters or gourami who prefer a calm environment, your fish will not mind it at all. You will even find many like to play in the bubbles.
Even if you do have those calm preferring fish, there will be places they can rest away from the bubbles, unless you have the airstone connected to a pump that is too strong and in a tank that is quite small.