Halo effect is the tendency to like (or dislike) everything about a person

The halo effect is a cognitive bias where one’s overall impression of a person influences their perception of their individual traits or things associated with them. If you like an actor/actress, you are more likely to appreciate their recommendation of the product they (have been hired to pretend to) like. If you like the president’s polices, you are more likely to also like his looks and tone of voice. The converse is also true: dislike of a person tends to negatively affect the perception of things associated with them.

#bias

see also:

• Availability Heuristic overestimates likelihood of events
• Generalization Instinct hinders thinking by using misleading categories