You old fogeys don't get out much, do you? 
As Scott Adams has taught us - beginning a sentence with “So” is a tell for cognitive dissonance. It means that you’re imputing something to your opponent that you just made up in your mind.
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So for the word ‘so’ substitute the word ‘therefore’. Feel better now, Mr. Pedant? Whoever “Scott Adams” is sucks raw rotten eggs.
You old fogeys don't get out much, do you?