To cruise for a bruising is to ask for trouble or act in a way that is likely to result in punishment or harm, but the speaker was not doing either of those things.
Consider the staetement "I was, to put it bluntly, not asking for trouble and not acting in a way that would result in punishment or harm.". Based on this statement, is "I was, in the parlance of an ancient day, cruising for a bruising." a true statement? Yes/no/unknown