I use break points when it 'breaks', not by a set width. As for font sizes it depends on the font. I generally base everything at 100% and simply adjust up or down depending as not all fonts are the same size.
I can see px, where are the pts?
Think he meant px, agreed a bad choice unless over 18, but mixing with % has some crazy results.
Edit: Helpful link, http://pxtoem.com/
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