Not looking down on others

Q: How does one stop looking down on others? e.g. I recently went for 10 days jamaat with 1 brother, and on returning home, the first week back he is already very slack with his amaal as before. Now the fact is that he is not punctual with his amaal at all, and I look down on the unpunctuality but say to myself that he is a good person and must make dua for him, and make shukr that Allah grants me tawfiq to remain steadfast, and think that I musn't look down on him because maybe our situations could be reversed one day, etc. So  in this situation is this considered looking down on others, pride?

Performing the Sunnah and waajib Salaah when one is a musaafir

Q: I work in a hospital, Peterborough, UK as a medical consultant physician which 58 miles away from my house, Nottingham. I stay in hospital accommodation for 5 nights and I return to Nottingham for 2 night. Whilst in Peterborough I do attend the salah in jamaat in the local masjid, Peterborough for Fajr, Asr, Magrib and Isha.

1. With regards to sunaah and wajib do I have to do full as a mukim?

Besides, during zohr prayer I cannot go to the masjid but I do salah al Qasr if other people are not around in the hospital prayer room. I recently come across a hadith in Arba'een of Imam Nawawi RA that if a person is punctual with four sunnats of zuhr and two thereafter, Allaah will make hell forbidden for him. I just feel that I am missing this great blessing if I do salah al Qasr during zohr time.

2. In light the above, can I perform four sunnats of zuhr and two thereafter, in order to derive the above benefit? Mufti Sahib I would appreciate if you could give a comprehensive fatwaa.