You can always preempt the whiteboard issue by bringing a laptop along.
"Hey, I'm a lot more comfortable writing code on a keyboard and with an IDE. Lets program this together in a text editor instead of a whiteboard".
Nevertheless, the interviewer was gracious and replied, "Fair enough" and stopped nitpicking my brackets and semicolons.
I was told they thought I might be difficult to work with.
That could go horribly :)
Being able to discuss things on a whiteboard is a necessary skill for working in a co-located office. This includes pseudocode.