Tension between foreign climbers and Sherpas began over 200 years ago

Source: Science Daily

Recent tragedies on Everest have exposed growing resentment felt by some Sherpas towards foreign climbers and the foreign companies profiting from the mountain. One source of dispute has been Sherpa concern that some climbers are not fit enough to cope with the altitude.

https://www.sciencedaily.com/releases/2020/01/200123095838.htm