Let’s make this clear:

I don’t care what the other guy or girl does.  If you feel it’s appropriate to kick someone who is prone on the ground, covering his head, you are not a sports fan.  You are not one of us.  If the alcohol makes you do it, then don’t drink the alcohol so much!

Fighting is not a part of sports fandom.  Applying beatings is a part of being a criminal.

Stop doing this.