It’s been more of a Twitter and grass-roots sort of dismissal for them, but it’s happened.
Here’s a very lukewarm article in the Hill that is typical of the genre. https://thehill.com/homenews/campaign/428083-beto-orourke-sees-stock-fall
This isn’t comparable to the full-on media and politician assault on Tulsi. As the article says, it’s a coordinated attack, involving the highest levels of the party. And the reason is that Tulsi’s the only Democrat who opposes our never-ending Middle East wars. That sets her apart from most Republicans as well — pretty much only Trump agrees with her.