If Thanos had, instead of randomly wiping out 50% of all living things, he had instead in each species wiped out only the dumbest 50% what would the reaction of each avenger have been?

See this is why I hate when people are like "just watch this 20 minute long video!" The video just restates what you said in one sentence that took me 5 seconds to read. It states it over and over again, slowly, interspersed with reading long quotes, slowly, for 20+ minutes.