I'm not sure why ask the question? No I wouldn't get on a flight with a pilot was high, nor would I get on if they were drunk or under the influence of any drug - I'm not sure what the question proves?
He didn't say the pilot in his hypothetical was 'high' he said he was "allowed to take ah smoke." Your answer imperfectly answers the conundrum surrounding marijuana use. Most of us would be okay with flying with a pilot who took a drink an hour before the flight. Many would not feel the same if instead of a drink the pilot smoked a joint. Why? Because THC affects individuals in ways different from alcohol, and is less predictable from individual to individual, and stays in the bloodstream a great deal longer... up to 30 days in many cases. This means that the individual is "under the influence" longer, having used marijuana.
This discrepancy is also reflected in the way the two substances are treated where it comes to DUI laws (at least in the US and the UK) where one is allowed to drink and drive as long as the blood alcohol content (BAC) does not cross the legal threshold of .08. Even so, there are tiered levels of impairment (above .08 but less than .10. Greater than .10 but less than .16. Greater than .16), with heightened penalties accordingly. Compared to the way marijuana is treated, where it is
per se illegal to have it in your system and operate a motor vehicle. This bias in treatment came about after studies showed that THC impairment was less predictable than alcohol impairment and that even at low levels, psychomotor skills were severely impacted. This, more than anything, invalidates the comparison between marijuana and alcohol.
If I wanted I could even get into my own personal experience in working with addicts and the fact that marijuana acted as a gateway drug in the vast majority of case, leading to addiction to another substance, originally introduced to the addict by "lacing" the weed with the substance.