From the point of view of a Segwit2x supporter, it isn't an attack, because it is meant as an upgrade - holdings on the Segwit2x chain are safe. And if an user doesn't choose to upgrade, he is leaving the "majority chain" and thus must take security measures - according to that point of view.

I already wrote that I don't support the Segwit2x fork anymore. But personal accusations of the SW2x supporters like Garzik do not help. That will make the miners that support SW2x - and the whole group of "big blockers"  - even angrier, and it would be more likely that they start a real 51% attack on the original chain if they have the power to do it. So it's better to use rational argumentation against the fork and try to convince the "moderate" and "unpolitical" folks.