People who say "He's not wrong" instead of "I agree with him" or "He's right"

I think it's more of a sense that there is some truth to an argument, but you may not agree completely.

So it's a wishy-washy way of agreeing with someone? Meh.

The worst. Very similar to, “I don’t disagree.”. Ok, then, passive aggressive and wishy-washy motherfucker, you agree.

Kind of what R1 says, but it also, a person can same something and all the facts they lay out are correct, (i.e., not wrong), but the conclusion or inference they draw isn't something you totally agree with.

People get hung up on the weirdest shit around here.

Hey OP..,.no problem.

It's used when one agrees with a specific comment made by someone everyone hates or with a controversial statement that is nonetheless backed up by evidence. Another way to say it would be "I hate to agree with him, but he's right about this specific thing. Please don't think I'm terrible."

In other words, OP, you're not wrong.

It has a completely different nuance from the othere. Think about "not bad" vs. "good." It's the same in Japanese too, for what it's worth (it's worth nothing).

Who the fuck are you, OP. Emily Post? Suck a toad.