It's difficult to believe that anyone would be so stupid as to consume alcohol and operate a motorcycle.
To survive on a bike, one needs all their faculties to avoid being mashed by other irresponsible individuals operating vehicles. Purposely impairing yourself before riding is tantamount to just putting one round in the revolver, and peering down the barrel.
One - reaction time is impeded. So, after you decide to do evasive maneuvers, you continue to travel a greater distance into the threat situation.
Two - your processing time in also increased. So, there is extra delay before you even recognize a threat situation, again bringing you closer to and injurious situation.
Three - If you are multi-tasking, alcohol can make you skip tasks altogether. It is indiscriminate which tasks it drops and most frequently drops or delays a new task being added. Further, the more tasks you are juggling, the more tasks get missed.
You are not superhuman and cannot override any one or all of the above which occurs when alcohol in in your system. It is part of human physiology, completely separate from conscious or intended thought processes. You cannot think yourself into a sober state of mind, even if you imagine yourself a good actor.
You are gambling that no personal threat will occur after alcohol consumption. Or, that other people will take your personal safety more seriously than you do yourself. How many times in a row can you roll a 6?
At least when driving a car, when you blow it regarding proper operation, there is some protection from your own ineptness and you only threaten others, like those riding motorcycles while under the influence.
And don't fool yourself. Just because your don't "feel it", in no way means you are not impaired.
I do drink. But, not before or during operating machinery.