I'm on ps4 as well if you press L1 + O it will change your targeting to Enemies only and then using left and right on the d-pad will not Target your allies. The way that I switch though is if you're holding R2 or L2 you can use R1 and L1 to cycle through your enemies. Try and watch whatever enemy has the least amount of health because that's the one that's most likely going to get ripped off you unless you see you clearly have enmity just cycle through and see if any are close to being ripped off