S-E-X Tips for Screenwriters: Reading for Friends and Strangers “Just Say No!”

Dear Paige,
I‘m a giving kind of guy, so I’m always open to reading the work of other writers. I’ve put a lot into building my skills as a writer. I think this is a great way to build relationships.
But Paige, some of these scripts… umm, stink.
Despite this, I’ll kill myself on creating the best notes that I can, only to tick off my fellow writer. WTF?
And it this indicates their level of craft and storytelling, I’m not exactly eager to ask for their feedback in return.