Saying that Scott Adams has been known to be irrational is at best tangential to the example he gives to qualify whether the Trump and Clinton campaigns are using emotional manipulation, especially ad hominem attacks, to achieve their respective goals.
It's an appeal to emotion built upon an ad hominem: you use your attack on Scott Adams' ability to reason coupled with an association fallacy [1] to attack me in order to invalidate my line of argument.
Specifically: Scott Adams is irrational; you presented an example by Scott Adams; you therefore agree with an irrational man; this makes you irrational; your arguments are therefore irrational; let's not bother debating your irrational arguments.
I might be wrong, so attack the flaws in my reasoning, not me or the author or my examples.