He IS still a baby so you can cut him a little slack.
What you can do is tell the people he's trying to tackle, I mean meet, that you are working on his manners and ask them not to pet or talk to him unless he's sitting (or laying down - whichever skill he's better at).
Me? I'm one of those BAAAAD people that encourage such behavior even with adult dogs.
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Raw Dog Ranch
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Piquins Too Hot To Handle - (Fuego) - Chinese Crested
Piquins Wasabi (Sabi) - Chinese Crested
Piquins Super Hot (Clark) - Chinese Crested
Banzai, Cloe, Mocha - Felines Extraordinaire
Neke, Tessa, Remi, Sadie, Riggs, Sasha, Tazer - DK, Mozart, Zoe - Gone but not forgotten