Some people just don’t take kindly to disrespect. This is usually from people that comes from backgrounds where respect is everything. There are those that just do not take respect and will call out anyone who disrespects them. These types of people are usually not to be messed with, though some make the mistake of messing with them.
Disrespect is not just seen as a verbal thing, but can be demonstrated through actions too. For example, talking to a guys girl in front of him is a clear act of disrespect. Stealing is also a form of disrespect as you are not respecting the person’s belongings and his/her ability to catch you.