Logical fallacy: It happens when someone makes the claim that something must be true of the entire thing since it is true of some portions of the entire thing.Its basically a Bad reasoning or a bad argument against a person argument
The main three logical fallacies
AD HOMINEM
is intended at an individual rather than the argument they are making
STRAW MAN
presenting someone's point falsely or inaccurately in order to undermine it.
SLIPPERY SLOPE
supposing that a single, relatively unimportant incident will have a number of unforeseen effects and produce a noteworthy result.