Yes I did that purposely.
Yes, I believe it matters regardless of the stereotypical McDonalds customer. Maybe if McDonalds had it right, customers who may be less educated might have a chance to learn the proper usage. Anyway, McDonalds is a business and should conduct itself professionally (should be responsible for using proper English in all ads, documents, and so on).
Well, I'm glad that other members here share my pet peeve and others related to using proper English.
I think its great that many members have actually learned about professional writing and proper grammar here on HybridZ. Thank you to all of the administrators who have made it possible for members to get a free grammar lesson while learning about the great Z car.