Lol you constantly spew stupid shit on this forum. Remember when you argued with me a year ago pretending you trained? I think you even tried to pretend you were a black belt lol. You've never stepped foot in a BJJ or MMA gym.
To refute your stupid logic there: BJJ and MMA are a sport, not fight clubs. And even if they were, why would a 120kg guy need to 'practice' fighting someone literally half their size?
And if they were just looking to learn self defense, and the average guy in the street is half their size, why should it be at the expense of hurting someone much smaller than them who is just there to learn?
You generally pair up with people close to your own size anyway, but if you are paired up with someone much smaller, it's gym etiquette to try and minimise your size advantage. Most coaches would pull someone up for imposing their size on an obviously smaller opponent in sparring.
If you ever did step into a gym (and let's face it, you wouldn't), you may as well go 100% on females too, right? Because you're just looking for fight practice, be damned who it is.