@lusytka,
Several issues are at hand...
Did you get the dog from a shelter? Sometimes shelter dogs when they have been exposed to abusive owners (especially men) they tend to act out against strange men they don't know.
His lack of interest with other dogs could be that he wasn't taught how to be sociable with other dogs when he was a puppy. I'm not so sure that adding a companion dog to the mix when clearly right now he shows signs of jealousy and aggression towards other dogs walking by him, let alone the possibility that he might have to share your time and love with him as well.
Well dogs bark at things like birds when they're not mentally stimulated or just feel bored or somehow feel threatened by whatever (whether it's irrational or not) .
The jealousy issue and the barking is unlikely to be related other then the fact it indicates you have a neurotic or jerk of a dog.
It might be a good idea to have a trainer help you with the dog... one issue at a time. I'd say the barking should take precedent. Just because a dog's a people dog rather then a dog's dog (AKA he rather spend his time with his two legged companions rather then other dogs) doesn't mean this is an issue in the first place. For all we know it's just his personality.
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