This is a good one. The use of fallacies doesn’t necessarily void an argument, it just fails to support it logically.

For example, I could craft a perfect, clean, cold-cut argument so water-tight and beautiful that even ben-fucking-shapiro would have a come-to-jesus. Calling my opponent a “dickhead” at the end (ad hominem) doesn’t prove anything, but it doesn’t nullify the entire rest of the argument either. Plus it’s fun.