Meat, by virtue of not being a plant has no toxins, no pesticides - both of which some people react to
This is absolutely false. Cows eat plants, and any pesticides in the plants can bioaccumulate in the cow so that it winds up with more pesticide than you would have gotten from just eating the plant in the first place. It's one of the problems with eating meat in the modern world.
This has some links to various high-level explanation: https://www.consumerreports.org/health/food-safety/how-to-shop-for-safer-healthier-meat-a1124955526/
It was actually pretty difficult for me to find a study about this that was (1) from the US and (2) not on some site that was clearly trying to promote one side of the battle or the other. But Consumer Reports is pretty trustworthy, to me.
You have to decide if correlation is important to you or not.
I have explained my thought process, why I think you need to be cautious about assuming correlation is causation when there is a clearly obvious alternative explanation for the correlation, but you can accept epidemiology in general instead of throwing out any study that relies on correlation as any part of its argument.
If not, then there is no smoking gun against meat. If correlation matters then there are opposing epidemiology to consider.
Opposing epidemiology that to me is hilariously weak and implausible, yes. I considered it.
I’m not aware of any problems with low grade meat.
You really should be. It's not just an issue with "low grade" meat. If you're in the US, you should know that most of the world won't even import our meat products because they are so full of hormones, pesticides, antibiotics, and all kinds of other fun stuff that they are illegal to sell in other first world societies. Do you really not know this?