That being said, Google search is 100% dead. I append “reddit” to every Google query to get actual results from people, and I don’t see it on Reddit, I give up on my query.
I still use Google, but man has it become difficult to get to what I want.
In any case, it is not sound reasoning to reject the entirety of an argument just because one of the subclaims is not a valid argument. Doing so is the fallacy fallacy.
In this case, it's true that name calling weakens the credibility of the post for a general audience. But I contend that we might not need need to care. It only weakens the credibility of the post for members of the audience who make the fallacy fallacy, and refuse to evaluate the other claims on their own merits.
Convincing or not convincing such an audience might not be a concern to an author focused on truth, since such an audience is persuaded by fallacies.
Another thing is that if a person is actually a bad person, calling them bad names describing how they are a bad person is actually a true statement and not an argument "to the man". In this case the actual claim that is being argued is the fact of the person's moral insufficiency. Calling them the bad name is just the conclusion of an argument.
The main snafu of calling someone names as a stylistic or concluding aspect of an argument is that it lacks the decorum. If the debate forum requires respectful decorum then an argument can be disqualified on these grounds.
However in this case the forum is the author's own blog. The author has clearly chosen to speak to an audience that can evaluate arguments without being set back by insults - presumably an audience who is already very upset at Google and wants to know which person they should be upset at specifically. In this role, I found the insults were actually rather enjoyable and funny!