Not it's not. Ableism implies discrimination.

Stupidity is not a protected class

Now, you could attempt to make the argument that me refusing to engage in a meaningful political discussion with you because I don't believe you have the required minimal mental abilities to achieve anything in a discussion of this type is some form of discrimination, but that would only paint you as even more stupid than I think you are

No, it's not.

It's rude, I'll give you that, but it's not ableism by any definition of the word.

That being said, I'm not surprised that someone who lacks basic political understanding and just spews right wing propaganda verbatim without a thought does not understand the meaning of words