This is a such a sad truth.
There will always be those who either enjoy making others feel bad or are so proud of their own high (imagined) standards that they feel it their duty to snarl away any who are deemed less than. It’s their way of dealing with the truth about themselves. For others anger and jealousy are the triggers. The thing is, you have the choice to respond or ignor them. I say ignor them. They thrive on response, they dry-up when they are ignored.