Hoo boy. I really don't have the time to thoroughly answer this question. All you need to do is look at the lineups he was screwing around with for the first 2 months of the season. And I would actually argue it's more with pitchers than with the hitters. Exhibit A: Intentionally walking Trea Turner with a 1-2 count to get to Max Muncy. Got national attention. Easy case of manager losing the game.
Look, I wasn't totally against TLR when he was hired. I wasn't "thrilled," but I wasn't against it. Hell he even got us to the playoffs last year. But if you've watched most Sox games this season, and have a good sense of modern-day baseball, I'm not sure how one doesn't question TLR's decision-making.
Lately, I think someone up front has been up his ass, because his lineups have been actually making sense.