JP talked about the basic primitive emotions, I think they have an incredibly overactive feeling of disgust all the time.

Imagine a happy person looking for any topic to be happy about.

Or a bitter person looking for any concrete reason to be bitter about things.

Or an attention seeking person looking for any reason to promote something to get attention.

They're like that, but with Disgust.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3189352/
Disgust: the disease-avoidance emotion and its dysfunctions
Disgust is one of the seven universal emotions and arises as a feeling of aversion towards something offensive.