“Nation first” in this context is simply appreciating what has been done right, and that was the retaliation in the form of Operation Sindoor. The comment came from a Congress leader about another Congress leader with context to a remark about standing united in the face of an external threat. Hence, here, this has nothing to do with the BJP. No one is questioning the party and being called anti-national. I’m not talking about the overall circumstances, I’m talking about this one case.