This is a form of pedantry that people consider insufferable. The reason is because everyone is well aware that the Ukraine was in conflict with russia since 2014, and even before really. Imagine your irritation at someone pointing that out, when you already know it also. We are all comfortable calling the recent full scale invasion "The war".
How so? Inflammatory would mean it's either irrelevant, unfair or harmful in some way. Stating a correction to a fact is hardly either.
If someone stated that the attack on Pearl Harbor happened in 1945 and someone else corrected them that it happened in 1941, is that inflammatory?
Edit: Maybe you're referring to it being called a "war" in the first place is inflammatory? I'd give you that, and we'd be better off calling it a conflict as none of the parties formally declared war, but then we start veering into semantics instead...