Seems standard. Donks do this to me all the time. Some even bet $1, while others bet $10. I raise them almost always, and they fold probably 90 percent of the time.

Obv if he raises you can fold, but the problem is if he just calls... then what? What if you hit your a/k on the turn, then what? bleh

Also, jw is this 50nl? The amounts seem more like it is 100nl...