are you asking for warming up or physical therapy reasons?
for physical therapy reasons...
Depends. sometimes one muscle is tight and needs stretched because the opposing muscle is weak.If you have weak back and workout your chest all the time then your chest will be very tight but your back will not be.. so there will be no need to stretch your back.
Other than doing stretches to warm up, uch as dynamic stretches.. generally muscles have a reason they are tight and need to be stretched. tight hamstrings can be a result of lower crosseed syndrome, and to fix them you workout your hams, abs, and glutes, as stretching them can make them worse.
for warming up:
stretching before a workout to warmup is fine. and you only need to stretch the muscles being used during a workout. stretching your biceps before doing bicep curls is fine.. but your triceps do not have a heavy enough workload as antagonist muscles to need stretching or warming up