The opinion you shared certainly seems infantile and problematic for several reasons:
Victim-blaming: The comment suggests that the current tensions in Ukraine are the fault of those who are supporting Ukraine in its defense against Russian aggression, rather than the fault of Russia itself. This is a form of victim-blaming, which shifts the responsibility for the conflict away from the aggressor and onto the victim.
Minimizing the threat of Russian aggression: The comment refers to Russia as a "Bear" that is being poked, which minimizes the very real threat that Russia poses to Ukraine and to European security more broadly. This kind of language can make it easier to excuse or justify Russian aggression, rather than holding Russia accountable for its obscene actions.
Fear-mongering: The comment also engages in fear-mongering by suggesting that continued support for Ukraine could lead to a nuclear war. While it's important to be aware of the risks of escalation, this kind of language is hyperbolic and alarmist, and can be used to justify inaction or appeasement. What's it feel like being an appeaser?