My professor was talking about how he worked for a company and when they were hiring, the boss said to throw out any resumes that had poor grammar and mis-spelled words, he said he didn’t completely agree with that.

I disagree.
When I own my own business, I’ll do the same thing; because there’s nothing that is a bigger pet peeve than when I see glaring mistakes. In fact, I might take it one step further and be a dick about it, and write the person a letter telling them WHY I wasn’t giving them an interview. Then I’d return their resume that I personally redlined.

That’s what I’ll do.
Because I’m a dick and a spelling/grammar nazi.