With the qualifier or not. It is snark, and the comment as a whole is not needed as I mentioned. It's very much like saying "I don't mean to be rude, but you're fat." Have the qualifier or not it's still rude. Also, if they aren't veiled (thinly veiled, I forgot to say) threats, then what are they? You admit that they are threats, so I don't know how else I am supposed to see them. I mean how do you expect me to interpret the last point that you just made? Not a threat? Finally, the fact that you say that your assumption is a mistake is in itself a bit offensive itself as well due to its implications.

In the end, what is the point that I'm trying to make? There are a lot of things that you don't have to say, and that there are better places and moments to say some of them.