I know but its kind of hard to not to when there's such obvious misspelling.
I was working on a data collection system for our State Library. Basically I was SAing the project and had to correct the programmer on the use of its and it's. In front of the Dataholder, he stated "I can never keep those 2 straight".
He was not the programmer very much longer.
Obvious misspellings may be glaring, but using the wrong version of a word (or a contracted instead of the correct word) can be just as deadly.