Unfortunately for Johnson, he was called out.
Worse yet, his face got completely messed up.
Even worse, to add insult to injury, his teammate David Price tweeted a picture of the carnage for all the world to see.
I'm willing to bet that Johnson has learned his lesson here, and will switch up his sliding technique at least a little bit.
There's nothing wrong with sliding HEAD first, even if it's occasionally a bit risky.
Face first, however, is never a good idea. You really don't want to be sliding across the dirt on your face. That's a bad look, homie.
Here's another picture of Johnson immediately after the slide: