How to make iOS stop asking about the same wifi I spend a lot of time in a location with a secured wifi.  I don't have access to it and never will. 

IOS 8 badgers me constantly to join that WiFi network.   Anytime I wake the iPad I have to tell it 1-2 times.  No. No. No. No. No.  How do I get iOS to stop asking about that particular network, without turning off "ask to join networks" altogether?

As you know there are several ways a notification can occur.  Badges, banners and alerts.   The "WiFi helper" always uses an Alert, which is the most intrusive one.  You know what I mean.  Is there any way to convince iOS to alert you to WiFis with a banner?  (Like my Android does?) 

I know I can turn off "Ask to join networks" altogether.   I don't want to do that.  I want the feature, I just want it to behave less lamely.   Did they fix it in iOS 9 or 10?  I am reluctant to upgrade because this iPad 3 is already sluggish and freezes a lot on iOS 8.
Short answer is no. 

You can have Ask to join networks turned on to be notified (as you've already noticed) or off to not be notified at all. There's no intermediary position on a stock, non-jailbroken device.