MoapaPk wrote:I know lots of small people (~45 kg) who don't ask for special treatment and often carry packs as heavy as mine (I'm a whopping 67 kg).
You've gotten lots of good advice for cutting food weight; if you are getting a sure source of water (from huts, streams) you can even dispense with the stove. My last three backpacks were stove-less. Just make sure you have food that you will WANT to eat at altitude, and will drink enough water.
I suspect the OP just needed to rant a little, about a (now former) friend. But to restate the advice above: you really need to vet people in a polite way, before a big undertaking. Maybe you can do it with polite questions to the friend's friends, or maybe with a few short trips. If you are just using the friend for transportation... well that is different moral issue.
It is worth waiting to get good outdoor partners. Otherwise there will be a bitterness in your memories of the event, and your main purpose in going -- to enjoy yourself -- is lost. We can also work on our own tolerance levels. I recall my blood pressure starting to boil as a friend folded and refolded his handkerchief, wasting precious minutes as a snowstorm moved in; then I thought to myself: if 10 minutes of kerchief folding makes that much difference, maybe I didn't plan the start time too well? It takes two to tango.
There's always going to be people who are a bit slower; If we can't deal with it we should be hiking alone rather than with others.