Answered by Shaykh Abdurrahman ibn Yusuf Mangera
If someone insists on touching feet during the congregational prayers, is it rude to move the feet slightly away? I find that it disturbs my concentration when people push their feet upto mine, although sometimes moving away causes bad feeling, which is just as disturbing.
Assalamu alaykum
In the name of Allah the Inspirer of truth
It is not necessary to join one’s feet with the next person’s while standing in prayer, however the shoulders should be joined and the rows should be straight and formed properly.
Hence, you may use your discretion about whether to keep your feet next to your neighbor’s feet or move it awaywhichever is less distracting to you. If it is people that you know and regularly stand next to you then you may take them aside and privately discuss the issue with them.
See the treatise Fiqh al-Imam: Key Proofs in hanafi Fiqh http://al-rashad.com/books/fiqh.htm for a juridical discussion on this topic.
Wassalam
Abdurrahman ibn Yusuf