I’m not sure about that specifically, but I think Lestat curses alot more than he lets on in the books.

[X by @mortcharmant, bc ppl tried to curb Lestat’s cursing by spritzing him w/ holy water, didn’t work.]
Noble or not, Lestat loves learning slang and sometimes uses it incorrectly, and that can be hilarious in itself. In general, I think he does try to keep it classy, if possible.