Why don't you come join the debate class I teach? Sounds as though you'd be a great team debater (spoiling for a good argument is one of the signs of a good debater).
You DO have a choice. The tips that are placed on your sail and sign at the beginning of your sailing CAN BE REMOVED. Okay, you don't like the presumptiousness of that policy. So noted. But no one is forcing you to tip. Just remove them and move on.
Lots of people (me) like the convenience of having those tips automatically added. If I feel I get inferior service, I can reduce or remove them entirely. If I feel as though I get far superior service, I can increase them.
Where's the sheep in that?? Better watch it - sheep might decide your comments aren't PC...