Also, whisper networks in tech are very much a thing and they are full of just the quality of people you would expect to find in them. When asked about people I truly can't stand, I say I am sympathetic to the barriers they faced to success and we didn't know each other well. It's not a code, it's the truth. I don't give much weight to the opinions of people who are cruel or have axes to grind either. This is a rare view.
Keep your public social networks well-pruned. Don't talk about plans, the future, or uncertain opportunities, and if you work for crappy people, get out as fast as you can before you give them an unlimited option on causing your reputation harm for the rest of your career.