Even when the author is himself/herself intelligent, bad proof-reading makes them look dumb. I lose interest where there are more than a couple in the book or article.
When I was growing up, we had to learn the English grammar, spelling etc. Everyone had to do well to pass.
it is a shame. Plus people spell like they text, and don't realize that is not correct English for a paper etc.
World has sure changed.
![Rose :rose:](//d1o9fadw0wez7f.cloudfront.net/Smileys/Lots_O_Smileys/rose.png)