Your dog sounds like a well adjusted animal! It is secure in itself and feels no reason to react to a lower ranking animal trying to be dominant by humping.

This is exactly the technique that a lot of dog owners should strive to emulate - if the dog bugging you is of a lower rank than you and you are secure with that then it is not worth bothering with. Your dog would only react to this if it was actually sexual or it felt it's dominance was slipping.

As long as your dog ignores it so should you.

Be proud, your dog sounds great, you sound great and your dog is only concerned with your pack - not the others.