[BeetleB]

I both agree with you and agree with your parent.

Yes, the chances of retaliation from your manager is not insignificant.

However, the experience with a good manager is always fantastic. If I don't trust my manager enough to give him negative feedback, I don't want to stay in the team. Giving negative feedback is one of the few reliable ways to discover if you have a good manager. I'd rather know than not know.

Source: Also been there and done that (and paid the price, but it was worth it).

The worst thing, though, is to put up with it. I tried it and it didn't end well either, which put me on the path of "Well if it's going to suck, it's better to be vocal than not."