I WANT TO MY DOG TO HAVE DOGGY FRIENDS, BUT...
If your dog shows aggression or fear around other dogs, STOP. Re-evaluate the goal. Are you wanting your dog to stop going after every dog? Or is your dog selective? If he's selective then he just needs a few, close, trusted friends that bring out the best in him. Set up playdates with some friends or neighbors with dogs of similar age, temperaments, and play styles. Avoid dog parks at all cost!!!
Your dog doesn't need to be friends with everyone. Now this doesn't mean that you allow your dog to be antisocial in a social setting. What it does mean is that you advocate for them and show them that they don't have to be in that type of a social setting in the first place.