Please stop double-spacing after full stops!

Urgh, I have to remove by hand so many second spaces from word documents, in order for the hidden extra space to not be encoded into a junk character in HTML. So many people are taught when learning to type that you should use a double space after a sentence. This was correct in the past when text was manually typeset and typewriters were the standard. Even latter when DOS based Word Processors were the norm this was correct. Why not now? you may ask, simple we no longer use monospace fonts, proportional fonts are the standard and old school hacks around the inadequacies of monospace spaces are just that HACKS. So unless you are using a monospace font, please for the love of all that is good in the world STOP DOUBLE SPACING AFTER FULL STOPS.

Thank You.