1. between jews and goyim: i think many are scared of becoming too close and have therefore taken the opposite extreme. also, if we’re talking about halacha, correct me if i am wrong but there are halachos regarding giving compliments or gifts to goyim, but basic respect is usually necessary.
2. btw jews and other jews, esp. different types of frum (neither of which are ‘modern’) — this i really can’t understand. as a normal, yeshivishe kollel-wife there are certain neighborhoods that i wont visit due to how i percieve i am being treated.