That is an incredibly strange view to take. Headbutting people is totally fine in your world?
No, hence the yellow card. But a bit of physical altercation between players doesn't at all annoy me as much as feigning injury, whinging and crying. And if there's anything bringing the game into disrepute, it's that. When people who prefer other sports look down on football, its not because of altercations and a bit of abrasiveness and aggressiveness - it's because of the crying, bitching, moaning and faking. There's not a single thing more embarrassing to the game of football, and it should be on top of the priority list of things to stamp out of the game - way higher than a bit of soft violence between opposing players with zero potential for injury.
So yeah, I'd love it if Fred got a yellow card in that situation, and Paredes got a red, and had to take the walk of shame down the tunnel. That would be total humiliation, which is how the game should deal with these ham actors. Add a 3 match ban as well, for brining the game into disrepute. Wouldn't mind that at all.