I realize it's not nice
Cruz in person is almost physically repellent. Psychology Today even ran an article by a neurology professor named Dr. Richard Cytowic about the peculiarly off-putting qualities of Cruz's face.
He used a German term, backpfeifengesicht, literally "a face in need of a good punch," to describe Cruz. This may be overstating things a little. Cruz certainly has an odd face – it looks like someone sewed pieces of a waterlogged Reagan mask together at gunpoint – but it's his tone more than anything that gets you.