This is so full of BS I may need to get out my boots.
People are down on Hanley because of one thing and one thing only; he's not performing to expectations. It's not because of dreadlocks, skin color or anything else. People were on him two years ago because he didn't perform. He put up good numbers last year (especially in the second half) and guess what, very little criticism. This has not been a good year and the critics are back. Ditto Young, he's not having a good year and isn't really doing the job he was brought in to do, hit lefties. Nothing to do with his beard (which quite frankly, I had not noticed).
What's the excuse for the criticism of Moreland for much of the season? Sale and Pomeranz are loved because they've been pitching well. Porcello has not and guess what, people are down on him.
Want to go back to the Manny era, how many people liked JD Drew? Don't recall a lot of "hate" for Pedro, but Schilling sure gets his share.
Bottom line in Boston and every other town, if you do well, most fans will love you, if you don't; they won't.