So you may hear some people claim that they have a high tolerance and can handle more alcohol than others. Tolerance is just a physical and mental acclimation to alcohol, developed after habitual use.

Just because a person is acclimated to being drunk doesn’t mean that they can make good judgments, make good decisions or have good motor skills and reaction times.

A person who brags about having "high tolerance" may have a drinking problem that, left untreated, could ultimately lead to alcohol dependence.

Also, tolerance does not fully account for the effects of alcohol on the brain and body.  Though someone may not feel the effects of alcohol, the body is still processing it, BAC can still rise and one can still lead to the same negative effects of over drinking such as alcohol poisoning

If someone taunts you about being a "light weight," don't get mad. Simply, look them in the eyes and say: "Congratulations, you can out drink me. Your tolerance means that you are just one step closer to a substance use disorder than I am."

Stanford University - Office of Alcohol Policy and Education