Calling someone a MILF is at best socially awkward. Using it on a coworker is grossly inappropriate. Plus if someone is problematic this early then they will likely continue to cause problems.

With that said, I worked with very stupid people. Great programmers but under-socialized. These people have no idea how much harm they are causing but will snap out of it if reproached by HR or management. I know that doesn't sound fair but there are a lot of dumbasses in our industry.