I have to admit that when I see a very long OP with little punctuation and no white space, I usually give up trying to read it and don't respond.
Before anyone jumps on me, it's not a criticism of the poster's punctuation nor grammar, I suffer from Sjogren's and sometimes my eyes are very dry and sore and it's difficult to read print at the best of times .It's much easier when the print is broken up with white space, highlighting the OP's responses would enhance it even further.
I do agree that it is annoying when someone comes late to the thread and posts a comment or repeats what has been already said, without reading what has gone before.
Another welcoming into Soop's kitchen for those who care to share...