CD Projekt Red have announced that their next patch will fix the font size issues in game.
At the moment, if an NPC asks you why you are looking funnily at them, its probably been because you are trying to read their dialogue.
Some players have been commenting the text is simply too small to read without getting up close and personal with their televisions.
The Witcher 3 is already up to version 1.03 with current fixes. So hopefully the text fix is already in the works.