Correct. You're thinking in the right way considering events outside of $A$ and $B$ though. For example, $B^c$ is part of $A$ and everything outside the two circles. However, when we see what is both in $A$ and this region, $B^c$, it is in fact the region you have highlighted in red.Thank You.
A∩Bc = A-B
So, we don't shade anything in the Universe (rectangle) right? (i.e. outside of A and B)