You don't think Cora is a good manager. Most Sox fans think he is. It's just the way it is. Fans often disagree about managers and their moves.
I disagree with you about Cora, but it doesn't mean I don't think you're a knowledgeable baseball fan. You are.
With regard to pulling Perez, this is the way Baseball 101 is now. The 3-4-5 hitters were due up for the Birds, for the third time, and they're all righty hitters.
And "pulling him if anyone gets on" isn't really a great strategy in a tie game, is it? If the first guy homers we lose anyway.
It's all just opinions though.