Not all people in the world are respectful.
When you are in a command position or publicly declaring your opinion (online posting), you will make decisions/comments that other people disagree with.
The disrespectful ones will attempt to cut you down by making crude comments intended to hurt you as much as possible, especially if they can do it anonymously. Often, they will pursue what sets you apart from the average population because bullies innately know that most people are self-consciousness about standing out.
If you are a minority, they will come after your race. If you are a woman, they will come after your gender. If you are gay, they will come after your sexuality. If you have a family, they will threaten your children. If you are handicapped, they will come after your disability. If you are attractive, they will insult your beauty. If you are ugly, they will insult your beauty. If you are obese, they will insult your weight. If you are thin, they will insult your weight. If you are a man, they will insult your genitalia. If you are a woman, they will insult your genitalia.
This is the way that the world works. No amount of whining online will change it; it just lets them know that they have hit home. It is not fair. Life is not fair. However, effective individuals accept this harassment as the cost of being a manager or public figure. They learn to absorb it, ignore it or thrive on it. Then they continue to move forward towards their goals.
If you cannot learn to deal with the harassment associated with leadership or public positions, consider less visible paths forward in life.