No need to be rude, I don’t recall being rude to you. If I came across that way, I apologize. 🙂

The opposite of beating a dead horse is beating a live horse.

The phrase, “beating a dead horse” means doing something that is accomplishing nothing.

So, beating a live horse means doing something that is accomplishing something.

The phrase has meaning because it’s implied the beater (or flogger) has just been doing something over and over again long passed the point of it being useful.