1. Vague thread titles
2. Bad formatting - it's not that hard to use periods and paragraph breaks. For those of us with attention issues, I generally pass on posts that are one huge paragraph.
3. Mean posters - some people say things that I know they would never say to someone's face. Or of they did, they'd probably be minus a few clumps of hair.
4. One word responses, such as "nice". That's only 4 letters. I mean, c'mon. Would you say that to a person who showed you their quilt in person? "Nice."
5. Threads that assume everyone here is female so refers to readers as "girls".