As a Sadler owner I find this really sad. What is it with extinction rebellion and old yachts? Why doesn't the owner do something useful and go sailing rather than splash pink paint everywhere.
All those who are overly sensitive about the use the boat is being put to, why not nip down to your local marina or boat yard and buy a once loved, heroic, brave, great, ex pride and joy abandoned boat and give it a home it so deservedly needs.
Alternatively, for just £50 a week, direct debit, you can adopt and receive pictures, plus real pieces of gel coat scrapings of a once beautiful much loved and cared for boat. In addition, annually, you will receive a report on how your boat is being surviving in the wilderness at the rear of the yard.
I find it very difficult to get worked up about how other people paint their boats.