How to show titles as plain text on rendered entity reference
If you have display suite. You will need to do this no in the rendered part, you have to do this in the view mode of the content type that you are rendering for instance. I have installed display suite and that helps me to have more control over the layout


profile product --> rendering entity from news product displayed as teaser
news product --> In news product in the teaser view mode or full mode in your case, in manage display choose the title and select no link. 


You need to have applyed a column layout in display suite to see it.