Some public actions that are inappropriate in private:

Making speeches
Cheering
Booing
Standing in line
Using a megaphone
Shaking hands
Debating
Acting self-important
Giving orders
Ballroom dancing
Playing to a crowd
Hooting
Hollering
Laughing hysterically
Drinking too much
Professional reserve
Self-consciousness
Heckling
Mocking those weaker than yourself
Pretense
Pompousness
Bowing
Curtseying
Saying one thing when you mean another
Wearing formal attire
Acting like a tourist
Cheating
Tipping
Padding your resume
Feigning interest
General fakery