I've run into this situation a few times now and I'm a little unsure if it is appropriate to flag.
It usually starts when I see a particularly bad question from a user with enough rep to suggest that they aren't exactly a "new user", being curios I check their profile* and find that they are definitely not a new user, and they've been asking these sorts of questions for quite a while now.
Is it acceptable to flag one of the users posts and ask a mod to check out the user's most recent 5-10 posts, and request that they do something about a pattern of behavior, rather than voting to close and/or downvoting the offending posts on an individual basis?
*I'm aware that its seen by some as a bad practice to check a user's profile and look for a pattern of behavior, but it seems like a fair assumption that if a user has been around for a while and is posting poor content or exhibiting other bad habits that they've probably exhibited these bad habits before and it probably should be addressed as a pattern rather than as an isolated incident.