As has been noted already, I agree this would be a very bad idea. It would create a lot of flag noise. I don't have much to add on that front...
If you really think there is a long-term pattern from some individuals that is far beyond the pale of being questionable, a better method would be a single flag to moderators, or perhaps even a staff contact. From there, you could link to some representative samples and express why you think the pattern of posts is bad.
But do keep in mind that chat is a quite different thing than the main sites themselves. Standards are much more loose for behavior, and they are relative to the regular users in the individual chatrooms. That is; if the regular users of a chatroom find some particular behavior to be acceptable, it's more likely to be OK.
That doesn't mean "anything goes". There are still some over-arching rules that apply. I know nothing at all of any specifics you might be referring to, but if you are truly convinced there is a big problem, I'd suggest my advice above - and then please leave it up to those you contact to deal with it appropriately.