Amazing as it may sound, bishops are sometimes are the target of criticism. The calling of bishop is inherently challenging. Add to that a few well-meaning, but cutting remarks and you have a recipe for lost sleep and ulcers. That said, there are a few things to keep in mind. These lessons apply to bishops...and everyone else.
The Church is composed of people. Sometimes, those people do things that are unfortunate and imperfect. Remember that before you take offense to any "friendly suggestions" that come off as brutal onslaughts. Most of the time, people really do mean well. They just tend to miss the landing, if you will. Work on the assumption that the "suggester" has your best interests at heart.
When a "friendly suggestion" is offered, look for the underlying reasons it may have been offered. The Prophet Joseph Smith once said that when someone made unjust accusations against him, he looked for the reasons which may have solicited the attack. If he looked long enough, he said, eventually he would find the reason. Then, he would work to correct the problem. That is wisdom.
So, from now on, waste less time getting offended and spend more time getting better. Take "friendly suggestions" for what they are worth. Is there something to improve upon? If so, do your best to make improvement. If not, do as the Prophet told Parley Pratt to do when he was fretting over a perceived slight..."Walk these things under your feet".
Either way, don't waste the time and effort on being offended. Get on with the work!