I'd argue that if you have a toxic team culture then no matter what you do things will escalate. Code reviews are a focal point but if they didn't exist then the focal point would move somewhere else. For example, engineer A commits some code and then engineer B rewrites it and then they get into an argument about it during a meeting. Toxicity in code reviews is at least auditable so a pro-active manager can nip it versus someone going off in a meeting they weren't part of (in which case it becomes a she said/he said situation).