One way to handle it if you are quoting is to go into the quotation, figure out the length of a line in the standard screen, go to that point on each line and do a hard return. That forces the line to end there and go down to the next line. If you want to be fancy, you can then go the the end of that short line, add a space, remove the return then repeat the first, above.
That doesn’t fix the original post but your reply will look far more intelligent than the original, sloppy post.
(Yes, you’re right that I hate it when people don’t respect the readers enough to format their posts when they insert a prewritten tract.)