How to dequeue the stylesheet without hacking the core?

The stylesheet for Simple Lightbox is enqueued in a very technical way, inside the plugin, through a javascript.

I’ve tried dequeueing it, to no avail.

The reason for dequeueing it is that there are aspects in the css I don’t like. Most of all the font it uses.

How can I dequeue the stylesheet?

Thanks!

http://wordpress.org/plugins/simple-lightbox/