DBs get way too much leeway (and receivers for that matter) with pushing and grabbing. This came into play often today, with calls and non-calls. The problem is that there are non calls on almost every contested pass that could/should be called. It is becoming much like the NBA where you have a mugging not called, followed by a touch foul called. 

FWIW, our guys are just as guilty as everyone else; I just hate to see the game get like this. Start calling it and coaches will stop teaching players to do it.