While I don't myself use the terms you have mentioned It doesn't bother me when someone does, after all it's not like the person actually knows you personally or that it even matters what someone tapping away on a keyboard elsewhere in the world has to say about you, when they have no idea what your really like as a person.
It's nothing more than a passtime, if you choose to get involved in online conversations then you should take into account that everyone is different and what may offend one person may not offend another.
We all have the freedom of choice to ignore what someone else has to say or to take part and express our own individual view but at the end of day does it really matter what someone you probably don't know or will most likely never meet in real life has to say... 
I apologize in advance for the insensitive nature of this quote but it is most fitting:
"Arguing on the internet is like running in the Special Olympics... Even if you win, you're still retarded."
