IS FEAR RELATIVE ?

I remember a childhood friend who could stand and face a hundred ‘black-belters’ in a brawl and continuously reiterates his vow never to flinch until being beaten to a pulp, the sight of a wall gecko scares this same guy like some lily-livered chicken. I know a lady who could touch a naked wire with her hands , she fixes fault in electrical wiring in her room but shivers if she sights even the harmless of all dogs. so I asked; do we all have different activities or things that scare us or ones one is brave and fearless it cuts across all spheres of one’s life?