No information on villain.

I'm wondering where we draw the line between caling this flop donk and folding to it. My hand is as good as KK here, and I think KK has a pretty tough time on this board. My assumption is that fish don't donk draws, and that when they do donk with any sizing >=50% pot they will almost always continue on the turn. I find this to be the case very frequently, especially when they use larger sizings. With these assumptions I was pretty unhappy calling the flop here, but did it anyway because I felt like it would be "too nitty" to fold... logic...