Was this douchy? (workplace situation)

[DING-DONG YO]

Was it douchy or am I an overanalyzing tard?

I was in a work meeting today with some higher ups (c-level guy and some of his direct reports of which I am one). the meeting is about 2 hours long and people come and go to give their reports and leave.

I went first and as I was walking out, another guy who I have been working with more than usual lately gives me the polite half smile that everyone kind of gives each other in these things. I gave him a gentle "shoulder slap" on his right shoulder with my right hand as I was walking out. Kind of a cammradierie "hey buddy" type thing.

As I was walking out, I couldn't help but thinking, was that a douche move? Was it appropriate for situation? Even if this guy was a good friend (which he isn't), would it have been appropriate?

Am I just an emo over-analyzing douche?