Dude, you're literally defending drunk driving. Please educate yourself on the effect of alcohol on decision making and reaction speed. Just because someone thinks they're not impaired doesn't mean it's true and how they feel doesn't play any role in it whatsoever
You are wrong. Someone with a high tolerance won't be drunk, but they'll have the same amount of alcohol in their blood as someone who is wasted and has a low tolerance.
You should not drive at a fairly low blood alcohol level either. Reaction time and decision making abilities are limited even if you don't feel anything consciously. Although, I get the feeling that you're not capable of making good decisions while being sober either, so maybe for you it doesn't make a difference.