Why is the right hand preferred over the left hand when
greeting, eating and in other cases? What is wrong with
using the left hand for these purposes?.
It is part of Allaah’s complete blessing upon us and the
perfection of this great religion, that Islam organizes all
aspects of our lives. There is nothing good but it has shown
it to us, and there is nothing bad but it has warned us
against it. As well as beliefs, acts of worship, interactions
with others and morals and manners, that also includes our
private affairs in which Islam shows us the way that is
befitting to man’s noble status and the way in which Allaah
has honoured him. That includes the way the Muslim eats
and drinks, and so on.
This is an established principle in sharee’ah: that which has
to do with honour and nobility, such as putting on one's
garment and pants and shoes, entering the mosque, using
the siwaak, putting on kohl, clipping the nails, trimming the
moustache, combing the hair, plucking the armpit hair,
shaving the head, saying salaam at the end of prayer,
washing the limbs when purifying oneself, exiting the toilet,
eating and drinking, shaking hands, touching the Black
Stone, etc are all things which it is mustahabb to start on
the right or use the right hand. As for things which are the
opposite, such as entering the toilet, exiting the mosque,
blowing one’s nose, cleaning oneself after using the toilet,
taking off one’s garment, pants and shoes, and so on, it is
mustahabb to start on the left or use the left hand. All of
that is because the right hand is more noble and honoured.
In Saheeh Muslim (2021) it is narrated that a man ate with
his left hand in the presence of the Messenger of Allaah (S)
. He said: “Eat with your right hand.” He said: I cannot. He
said: “May you never be able to,” for nothing was
preventing him from doing so but arrogance. And he never
raised it to his mouth again.
The Prophet (peace and blessings of Allaah be upon him)
prayed against him so that what he claimed of not being
able to do it would come true, because he was too arrogant
to follow the truth and he did not observe proper etiquette
with the Prophet (peace and blessings of Allaah be upon
him), and his excuse was a lie, and lying to the Prophet
(peace and blessings of Allaah be upon him) is not like
lying to anyone else.
This applies if one is able to eat with the right hand. But if
one is unable to do so, there is no sin in that. Al-Nawawi
said in Sharh Muslim (13/191): The objection to eating and
drinking with the left hand applies so long as there is no
excuse. If there is an excuse which prevents one from
eating and drinking with the right hand because of
sickness, injury etc, then it is not makrooh. End quote.

To sum up what the scholars have said about the reasons
why the right hand is preferred for things that are noble:
1- That is differing from the shaytaan, as in the case of
eating and drinking.

2- It is honouring the right hand over the left.

3- It is using proper etiquette with people, so that one does
not shake hands with them, take things from them or give
things to them with the hand with which one removes
impurities.

4- It is a sign of hope that Allaah will make us among those
who are on the right hand (ahl al-yameen).
And Allaah knows best.
www.islamqa.info/en/82120

*yawn*

lol... interesting

Alhamdullilah

So what if one was born with a bad left hand?

So what if one was born with a bad right hand?

This post is Islam centered! not a good answer