"I don't like to critique other bloggers, because I know how hurtful I'd find it, if someone were to correct my mistakes. However, it is rather galling when people give bloggers a bad name by publishing badly written posts. I don't demand sparkling prose, but it's not too much to expect a "writer" to have a reasonably good grasp of grammar and syntax (and now I'm worried I've made a mistake in this post!). And for them to go back and proof-read to find any mistakes. "
I can relate to this. I work with bloggers every day, I remember what is was like to be in their position and I always try to be kind. However, at the same time, if you are going to write material you want other people to read you do need to make sure it is intelligible, and proofread, proofread, proofread. If you want to write professionally, then it's not enough to just be literate, you do need to have some talent, wit, empathy, and a very, very thick skin.
And if you're a blogger you have to accept that not everyone will agree with you. It's part of the job. You share your opinion, other people can come along tell you you're wrong.