It's not, you just made one of the most basic and most common [probably THE most common] grammatical mistake in the English language and deserve to be corrected for it.
"It is" stop using a *******ised version of the English language if you want to be such a grammar Nazi about it.
Is your "I" key so precious that you have to use "'s" instead of " is"
			
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 how come you are using contractions only some of the time