A position is resignable exactly on the moment YOU think there is not any other result possible then you losing.
Unless offcourse your opponent asked you to resign, then you should always play till the bitter end taking as much time as possible. Just for the fun off it.
if he wanted you to resign so badly he was probably scared you were going to win lol, i've been called "gay" and "you little f*ck" after checkmating people before on here , probably similar type of psychology going on