I'll give you one for now...
People not washing they're hands after going to the toilet.
Oh and one I hate is not being able to use the correct there/their/they're in a sentence...Because I suck![]()

3. People who do not indicate when driving (particularly at roundabouts)
People who say "Hello?" when they didn't hear what you said..
People not washing they're hands after going to the toilet.

People who can't spell / Poor grammar
Chavs