Am I old fashion?

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I really didn’t realized, it’s out dated.  Till one day my boss asked me in a very annoying tone after reading my email and said why there is two spacing after a full stop.  He said how ugly it looks.  I told him always two spacing after a full stop and one spacing after other punctuations.  He thinks what I said is ridiculous.  I didn’t argue with him as he is my boss.  I was confused ….. well, I am confused even now!

Then I asked opinion of a friend who is an editor.  He told me I am an “old” lady.  No one uses two spacing nowadays .  Even it is true, no need to be so angry right?

What a big deal?  I still not understand.  Anyone wants to kill me?  I am using two spacing after a full stop!