Grammar Police on a Rampage

Here is a great list of 32 common grammar mistakes in English, very helpful:
http://helptutorservices.com/blog/the-32-most-commonly-misused-words-and-phrases/comment-page-14/#comment-989

However, it touches on a philosophical point for me, brought home by reading the comments on the page. Here's my perspective, as I commented on the post:

The more multicultural we become the more important it is that we be tolerant of each person's level of mastery of English. It is fine to feel superior if you have superior knowledge, but remember it's not actually a sign of intelligence or breeding or any other such nonsense. It's certainly not a sign of graciousness to hold someone's mistakes against them.