Why is being a lightweight drinker an insult?

Because that means they are disqualified as the designated driver and that burden has been passed on to somebody else who had plans to forget what they did that night.
 
Sober people don't like to be around drunk people so if you get drunk 30 minutes before everyone else then you are annoying for 30 minutes.

Drinking is cringe anyway, do something productive like cocaine or meth instead.
 
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