I honestly don't think you would get into any sort of trouble from doing that. I mean saying stuff like that these days sadly is a lot what internet is like these days. (Especially in the younger age community, they throw rude words out like there's no tomorrow, they probably don't know they can cause real harm with that).
I really don't think the staff would so sensitive about banning anyone because of them being rude to someone especially if it's once or twice thing. They might look into it more if you keep stalking someone to be a constant bother or do it often enough in many places which would obviously lead into many reports piling up. If you had dozens of these and show to be a constant bother by being very rude to everyone I think that might be a different case. Even during those I'd question the chances of getting banned, I mean I'm quite a sarcastic asshole myself most of the time if I know you, it's just sort of the way I speak in, I might have probably been banned for long enough of time worth of few lifetime lol.
Anyhow I think you'll be fine, try not to worry about it too much. If something comes out of it, I'm sure you could message the IMVU team back and see how does that go.
But seeing how many rude people runs around I doubt they even react to this kind of report at all lol .