I got a flat tire should I replace all 4 tires?

So the rear tires wear out faster than the front tires in tacomas?

 

All things being normal, you are in a full time rear wheel drive vehicle... so rear tires would tend to wear faster.

Unless one drives like these morons that race towards a red light and then slam on the brakes then whine about gas mileage...
But even then - rear would likely wear faster...

(I sense a triggering event somewhere...)

 

If your tires are less than 50% worn, I wouldn't worry about it.
Over 50% - two new ones on the same axle.
Over 75% - four new ones.
If you make it to 120% wear then you are the kind of guy that should probably replace a spare too. ;-)