I'd say it would be quite difficult to foment anti-war sentiment in the same way as the Vietnam War era. The West capitalised on 9/11 and was able to very effectively sell the Iraq War (and subsequent wars) to the public because of this. I don't think there was anything quite like that even in red scare terms for Vietnam.

Plus, another crucial difference is that Vietnam War-era America had conscription with roughly one-third of America's military personnel being conscripts who were drafted, it's generally a lot easier to get people to be against something when it obviously infringes on an individual's ability to choose to not participate without consequence. Nowadays though, it's an all-volunteer force that is very unlikely to be receptive to the same messaging.