Those kind of errors bug me when the writer is implying that they are highly educated and know everything, it makes me LOL.
Especially the "noone" along with alot.
I am sure I make my share of typo's, etc. but try to double check my grammar & spelling.
My biggest pet peeve is that many people have trouble reading a post and then replying to what was written. Examples of such are easily found, I am too polite generally to point them out. (to too two was always one of my own problems - LOL) As well as the use of unloosen which had to be beaten out of me by my older brother.
If your biggest hardship in life is getting upset over this kind of stuff then you are living a good life!
ps - have a hoppy holiday - drink beer