Since the OP seems to have raised the question only regarding ethnic and religious groups, I take the liberty of using pejoratives for many of the posters on this thread: You guys are idiots.
“Shvartze” is no more insulting than “black”; “Goy” than “Jew.” Granted, people could use certain tones of voice and contexts to turn a neutral word into an insult (including such words such as “tall” “black” and “doctors”), but no blame lies on people who use them.
Here are some real-life quotes from the above idiots.
Would she have preferred “goy”? I think I remember hearing that Arafat found that term offensive.
Oh, Arafat is am etiquette master now? I assume he also found the term “Jew” offensive.
. I don’t like them at all, even Goy, preferring non-Jew. One should also strive for lashon nekiah.
Just because one person may have been offended by a the term non-Jew doesn’t mean there is anything wrong with the term. Is there any sane person who thinks being called a non-Jew is offensive, in a world of rising anti-Semitism?
“Goy” was made into an insult by Jews who hate religious Jews (Sorry, I don’t use the senseless term “Self-hating Jew”). The word has been in use for centuries and won’t fall into disuse because “one person [or persons] may have been offended [or pretend to be offended] by a the term”.