I’d just like to elaborate on this excellent piece. The specific logical fallacy described is Guilt by Association which is a type of Ad Hominem fallacy.
“This form of the argument is as follows:
- Source S makes claim C.
- Group G, which is currently viewed negatively by the recipient, also makes claim C.
- Therefore, source S is viewed by the recipient of the claim as associated to the group G and inherits how negatively viewed it is.”
The best and clearest example of this would be the Hitler is a vegetarian example. Does that make all vegetarians fascists?