Hypersensitive to smells, sounds, textures? Are some people like that, or they are exaggerating?

Genetic programming. Some people are genetically programmed to be hypersensitive neurologically. Some feel touch more intensely, some are supertasters, etc. Some of these abilities are gifts and some seem like curses at times. It is thought that this genetic diversity had survival benefits for us as primitive peoples. Those with acute hearing could be early warning systems for the community, etc.