AIBU about being grassed up

[Milliepede]

Not so much of an AIBU but am posting for traffic.
A so called friend has gone to my boss because I said something negative about work on FB. Where I work takes that sort of thing VERY seriously. I don't think what I said was that bad, I expressed I didn't like my job or the team I work with (some of them are ok). I didn't say anything bad about the organisation itself but when asked, I stupidly said where I worked and have "damaged the organisation's reputation".
I am more pissed off that a "friend" has said something and actually screenshotted the post to show my boss.
Just a friendly reminder to be careful who you trust and becareful what you post on social media.

Dear gods the OP doesn't need a bunch of willy waving "managers" or holy joes to tell her she should be on the naughty step. She already knows that.

Oh, thank goodness we have you here to tell us grown adults how we should behave! What on earth would we have done without you? None of us could possibly have decided for ourselves whether the OP was right or wrong. All hail the genius follow-up post telling us what we can and cannot do!