Yes Alex you are correct. On reflection I can see that my arguments that parallels of latitude are straight lines were incorrect. I have deleted them to avoid confusing any students reading this thread. To avoid any charges that I have attempted to hide my mistakes I have also stated the reason for the deletions.
All of the other arguments in my posts remain unchanged.
As for your suggestion that I am being pedantic:
1. RichardH stated that Rhumb Lines are straight lines.
2. You stated that they are curves.
3. I stated that some are straight lines and some are curves.
Of the three statements, mine is the most accurate. If that is being pedantic then all I can say is "Guilty as charged your honour."