You could configure which apps are allowed to show toast notifications. If an app creates a toast it will be collected and added to the list.
You could deny *all* toasts of an app or only *specific* messages.
With a donation you supports this app and get more options.
Your device has to be rooted to install the required X-posed framework: http://tinyurl.com/cd46qco
Donator-App & Features: https://play.google.com/store/apps/details?id=de.defim.apk.enhancedtoast.donator