is this an innapropriate picture to put on facebook?

[anonymous]

my coworker commented today at work about how "i shouldnt put up what i put up on facebook the other day"

im in college, im 20. i use the iphone app instagram, and its just a picture of these shots we had. just a picture of 3 shots. no ones in it, no ones in it drinking them. it was a long time ago. i just put it up because i thought the color effect i put on it looked cool. i didnt put it up to show im cool or whatever.

but she kept saying that ill get in trouble for it. it was really annoying. shes new to facebook and doesnt have a lot of friends on there, so im probably all over her news feed.

is having a picture of 3 shots a big deal??? no ones in it. and im not a big drinker anyways. i have no pictures of me drinking at all. so i dont get why shes making a big stink about it. it wasnt a picture of me chugging beers.

what do you think?
it was just a picture of shots. thats it. maybe i shouldnt of put it up. but my coworker is in her 40s. she kept telling me to "stay out of trouble too" all because of one pic that was not even that bad.
i didnt put it up to show im a drinker. i just htought the effect of it looked cool. that was it.
if i was 16 then ok, its innapropriate for sure. thanks for your input everyone.