Your question was about why many hackers stereotypically don't like sales people. I gave you the information you were asking for. If you want validation, I charge $500/hour.
If you were asking me, nowadays it's network analysis/visualization. But I am very much a solo hacker and not product oriented, sometimes to an unwise degree.
I don't hate sales people and think they provide a valuable service many engineers would rather not have to deal with; but the hyper-competitiveness of many sales folk optimizes for a zero-sum scarcity paradigm that is often in tension with what motivates engineering types.