Are spiders friendly

Spiders will react to defend themselves. If you are not endangering a spider, it will most likely not hurt you.

Spiders and lower forms of life do not experience the kind of emotions we humans do. As the first respondent replied, they react by instinct for defense. They do not have the capability of a higher level of thought which vengance requires, like us supposedly higher life forms. Spiders are incapable of vengance.