Well in Serbia where I am from we pretty much use swear words in our daily vocabulary. And they sound pretty bad compared to swear words in english.

I doubt iTalki’s user guidelines allow for profanities here, at least I’ve never noticed them and don’t use them myself. I think it’s normal for a profanity in one’s own native language to seem worse to the native speaker, while when a non-native speaker uses the same word or profanity he or she doesn’t seem to perceive it so badly. It’s just that the native speaker has more experience with the profanity and more of a feel for the depth of its meaning and use. In the US, before the internet, you never heard profanities (like the “F-word”) being publicaly broadcast on radio or TV. These words were even edited out of movies shown on TV. A list of profane words was banned by the FCC (Federal Communications Commission) and any broadcaster on TV or radio station who let the word (s) slip out faced huge fines and penalties or even revocation of the broadcast license. I also think it’s a generational thing. When I grew up you never used those words around your parents or grandparents. (My mom and dad would have flipped out hearing me say those words.) But,  now with the free use of any word, however profane, on YouTube and internet podcasts and Sirius radio you hear this all the time. I frankly don’t like it. Younger 20-something’s with YouTube channels trying to sound like broadcast journalists started and ending every sentence with the F-word is a real turn off to me. I tend not to listen to anything they have to say, however educated they may be, because I think these people (I say age 20-39) who grew up on the internet just sound like brainless fools. I’m sure it’s just an age thing. I liked the old way better myself. Don’t use those words and try to sound intelligent because it just doesn’t work and I don’t use those words in polite company. 

In my country on TV there  could be some tough language  but you will never heard on TV some Russian  profane words. I watched movie Pulp Fiction there was a lot profanities and even bad racial slurs. Was that edit out when broadcasted on TV in US?
in my native language I don't like when speech contain half of profanities but  if one or two bad words I can tolerate. But if it in English language like in Tarantino movies it feels totally fine.