Salaam & Greeting

Q: To make Salam to others is sunnah. If a person does not ever make salam to others, is he a sinner? Can we blame him?

If a group of people come to another group and nobody in the group does Salam, will they be at fault?

Q: What to reply do I give if my non-Muslim friend says salaam to me?

Q: When making mu'aanaqah, should one put his head to the right or left? Some people go to the left and some go to the right sometimes causes a head bump.

Q: If I am very certain that if I give salam to someone, that person won't answer me back as it happens always. Should I give salam to that person  everyday when they enter the home or should I refrain from this as it is increasing their sins?

Q: What should the response be when a person messages with the greeting "Salaams" instead of the full AssalamuAlaikum?

Q:

- حَدَّثَنَا عَلِيُّ بْنُ حُجْرٍ قَالَ: حَدَّثَنَا عَبْدُ اللَّهِ بْنُ المُبَارَكِ، وَهِقْلُ بْنُ زِيَادٍ، عَنْ الأَوْزَاعِيِّ، عَنْ قُرَّةَ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ الزُّهْرِيِّ، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ: «حَذْفُ السَّلَامِ سُنَّةٌ» قَالَ عَلِيُّ بْنُ حُجْرٍ: وَقَالَ ابْنُ المُبَارَكِ: " يَعْنِي: أَنْ لَا تَمُدَّهُ مَدًّا «هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ، وَهُوَ الَّذِي يَسْتَحِبُّهُ أَهْلُ العِلْمِ» الترمذي حذف السلام: الإسراع به التلخيص الحبير وَفِيهِ «حَذْفُ السَّلَامِ فِي الصَّلَاةِ سُنَّة» هُوَ تَخْفِيفُهُ وتَرْك الْإِطَالَةِ فِيهِ. النهاية

Would saying the salam slowly and not quickly be contrary to the sunnah

Q: How should we greet and reply  to the greetings of the La Mazhabis?

Q: If somebody writes only "Salam" instead of "Assalamu Alaikum". Is it ok for both, to be written and to be said?

Q: I have seen many people that when their feet touch someone else, they make salaam to him. They touch the person and touch their own hearts and then touch their own mouths. Is there any basis for it and should it be done?

Q: Can siblings kiss each other just on forehead or cheeks, can I hug my sisters? We three met after 17 years.