La ilaha il Allah, As-Salaam (The Peace) will give YOU the salaams. Allah ta’ala says in Surah Yaseen ayah 58: سَلَامٌ قَوْلًا مِن رَّبٍّ رَّحِيمٍ , “Peace! A word of salutation for the Lord, Most Merciful”.

And let us not forget when the angels take away the souls of the righteous, they will say to them: Salamun Alaykum! In surah Nahl ayah 32, interpretation of the meaning: Those whose lives the angels take while they are in a pious state saying (to them): salamun Alaikum (peace be on you) enter you Paradise, because of (the good) which you used to do (in the world).”

And this tradition of salaams goes back all the way to Adam alayhi sallam, in a hadeeth we learn that he gave the angels salaam and they responded to him as well. (This hadeeth is in Bukhari and Muslim)

amd Allah ta’ala says at the end of this ayah: He is Haseeb–He is keeping a record of how we respond, and He Knows how we are greeting our fellow muslims. And each will be rewarded accordingly.
As the Prophet sal Allahu alayhi wa sallam said, every muslim has 5 rights upon us: and one of them is that we return their salaams. (This hadeeth is found in Saheeh Muslim #5378)

InshaAllah we should take giving the salaams more seriously, and remember this is what Allah ta’ala and His angels will, with His Permission, say to us when we die and enter Jannah.

As for adaab on greeting brother Ibrahim, you should read the chapter of giving Salaam in Riyad as-Saliheen by Imam an-Nawawi, here inshaAllah: http://www.masmn.org/documents/Hadith/Riyad_Us_Saliheen/05.htm

Asalamu Alaykum wa Rahmatullahi wa Barakatuhu

Al-Zarqaani explained the reason why Maalik did not like that, in his commentary on al-Muwatta’: Because of the fear of fitnah when he hears her returning the greeting.

Proof: http://63.175.194.25/index.php?ln=eng&ds=qa&lv=browse&QR=39258&dgn=4