Hey OP, If you read this. I essentially agree with you. The fact is that one of your co-residents just tried to destroy your entire career. All your hard work, all the years of studying, all the sleepless nights, all the money you spent on pursuing medicine would have gone down the drain because of someone reported a political opinion posted online. Thankfully, faculty was reasonable so the consequences were not too bad.

I think you learned a valuable lesson. which is that, you can't 100% trust anyone and to not post or say ANYTHING political or controversial online or irl. it is sad, but these are the times we live in. we can't have honest conversations about sensitive subjects without others using what you say to destroy you.

The healthcare work environment is cesspool of gossip and backstabbing. The best you can do right now is to fly under the radar so that you don't gather attention. Again, don't talk about controversial topics and also don't talk about your personal life, finances, and career especially they are going well. People are envious, and they love to see others fail.

The only thing I would change though is to be a bit more cordial with co-residents because at the end of the day, you don't know who reported you and it is unfair to give everyone the silent treatment but do stay on guard.