Hey!!!
Is it excited to see them wanna play too hyper issues or is it aggressive bark and lunge not too friendly issues?
How is he with the meet and greet - proper sniff and tail wag?
Is there a place to socialize him off leash? Do you practice good leash skills as in not letting him pull, sit and stays at lights/inter sections, sit and wait while other walkers go by?
More details please.