[quote=@DarkwolfX37]
<Snipped quote by Meta>

It's based on you repeatedly showing it to be true in the past.
It's also incredibly hypocritical of you to support trump yet respond that way to a statement. 
[/quote]

Let me break that down. That assumes first that
You are correct about this, politically speaking. This brash statement cannot be made without that assumption.
Supporting Trump is automatically a negative statement as to my political understanding. This also connects to the previous assumption, that you are correct in this matter.
You know the extent of my political knowledge. We rarely speak politically, and no, it is not a matter of "from what you have said I already know." You don't.
That President Trump is a bad thing, also appealing to assumption one.
That there is evidence that my political knowledge is inferior, other than "because I said so."

In addition, the way you stated that already shuts down dissent; that's a logical fallacy. You can't just say that someone knows less than you as an actual point in argument. If you didn't state it as an argument, then it's ad hominem, another logical fallacy. It's also extremely arrogant to make the previous assumptions and just come out with "You're wrong, so it doesn't even matter."

And probably more than anything, it's just an unkind thing to say to someone who considers you a friend just because you disagree with them politically.