It really depends on the boss, the context and what you mean by "public". Voicing a strong disagreement with your direct manager, while in a meeting with your c

It really depends on the boss, the context and what you mean by "public". Voicing a strong disagreement with your direct manager, while in a meeting with your company peers is usually great and builds credibility. So long as you're not concern trolling, a good boss will usually take what you're saying into account and open up the conversation to others to ensure everyone is on the same page. If the boss changes their mind based on the conversation, then you've proven your value and the boss has proven their ability to put the needs of the company over their ego. It's a win-win. If nothing changed, that's fine too, you said your piece, you learned the reasoning behind the decision that was made, and now you have to commit to follow through on the decision your team made. At Amazon, there was a value called "Disagree and Commit", which is pretty much exactly this. I was not used to thinking like that before I worked at AWS (which was many years back now), but I used value all the time to justify voicing concerns that I hadn't been confident enough to voice at previous jobs, and it ended up being really helpful to me professionally - and to the company as well. The thing that really causes issues, is "airing dirty laundry". Ie, don't ever disagree around people outside of the company, don't complain to people above your manager or outside your org and don't gripe on company slack channels if it undermines your superiors.