yankel berel to me: You write that someone who argues on rishonim and meforshim about pshat in gmara is apikorsus.
Not necessarily so.
I thought I was being clear, but perhaps I wasn’t, so let me try now.
If you argue on a Rishon or one of very early and well-accepted Acharonim based on the fact that other people of equal stature to them argue, then there is nothing wrong, as long as you agree that אלו ואלו דברי אלקים חיים.
If, however, you reject a view of someone of that stature because it makes no sense to your small brain, then you are an apikorus.
Do you agree with that?
At any rate, here we are dealing with a third type of person: someone who rejects the existence of a view because they reject that view. That is, Rashi did not say it because it doesn’t make sense. If someone would make a shevua of that type it would be a shevuas shav because clearly Rashi does say it!