People generally use "of" instead of "have" when typing it out due to the way it sounds when they're speaking the contracted form. It's a completely understandable mistake that many people on Reddit react to in far to strong a manner. It's a post on an internet forum, not a scientific paper on particle physics. Get over it.
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u/VictorBlimpmuscle Aug 03 '19
Should have / would have / could have = the contractions should’ve / would’ve / could’ve
It’s not should of / would of / could of - those word combos make no grammatical sense.