I don't think it's that Musk denigrated your work. It's that Musk claims Twitter has a horribly designed product on the specific thing you specialize in. People

I don't think it's that Musk denigrated your work. It's that Musk claims Twitter has a horribly designed product on the specific thing you specialize in. People then spread this around that Twitter has a horribly designed thing that you specialized in building. Now there's not an off-chance that without anyone actually knowing the source, people in tech just "know" that Twitter has a horribly designed X. You, in charge of X, are now collectively understood on your resume as a horrible designer. Think of it like this: I cannot name probably more than a handful of Google abandoned projects. But whenever Google announces a new project I'm happy to meme about how it will be inevitably abandoned. It's just something I "know" despite not hunting down some weird statistic of exactly what percentage of Google products to market survive after X years. Reputation isn't a science. It isn't even that well correlated with truth.