If they don't have any actual constructive input about what about it is bad, I'd ignore them. There will always be people who want to drag others down because it makes them feel powerful, or who want to pull people who are doing better than them down a peg because they feel bitter or jealous, and it's best to just not engage and to keep on winning.
All that said, I do sometimes see people reacting to actual attempts at constructive criticism as though the person has just attacked them. Sometimes people, even jerky ones, have a point, so if a person points to a specific issue, I tend to keep it in mind, even if they're kind of mean, and if multiple people separately bring up the same issue in their feedback, it's probably something to improve rather than doubling down to be defensive.