Start small.
Concentrate on YOU and your closed ones.
I am sure there are lots of self-help books about it, but you need to realise that 1) you are not as important to others as you think you are. I mean they don't care as much as you think they do, they have their own issues.
2) bitchy people are miserable, so any negative come from someone with issues. Happy people are not mean.
3) you will never make unanimity anyway.
Take a very small example: half the country has desperately been trying to paint their house in grey from top to bottom, because they think it's the right thing to do to fit in. The other half is laughing or allergic to grey.
Ignore both, go on pinterest and save what YOU like and are attracted to. Then paint your wall the way you like it. Even grey.
and repeat for everything.
At work, do you want to stay where you are, or do you want to earn double for the same hours? When you are promoted, 3/4 of your "friends" will be jealous and you will have to make unpopular decision. Because there's a business to run.
Same for everything. It is easier to live in a city as no one cares, than in a small village, but it's very possible to not care in either of them.
Negative opinion is either justified because you are ridiculous or hurting someone, or from jealous and bitter people.