Can anyone here get away from this?

[arod15]

I find myslef Kicking myself over situations like this. Does anyone get away from this and whats the reasoning. This is perhaps my biggest flaw. I havent been making folds enough.
2-5NL Live
Hero Dealt A [img]/images/graemlins/diamond.gif[/img]k [img]/images/graemlins/diamond.gif[/img]
Villian (560) Button raises to 20
Hero(780) Button re-raises to 50
Villian Calls (total pot 107)

Flop K [img]/images/graemlins/heart.gif[/img]8 [img]/images/graemlins/diamond.gif[/img]2 [img]/images/graemlins/club.gif[/img]
Villian leads for 35$
Hero reraises to 100$
Villian without hesitation moves all in.
Hero shakes his head and of course donk calls the obvious 8 8. How bad is this call? Is this forgivable?