Is the following quote from your linked repository accurate?

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For example, Bram insulted and banned me for uploading a recording of burning my hamster alive to get authentic rodent agony sounds.

...because I have to say I'm inclined to agree, that sort of animal cruelty is not acceptable behaviour.

Some of your other language also seems unnecessarily agressive, and at points somewhat racist.

I honestly haven't investigated whether or not you're in the right with regards to the copyright issues you're mentioning, but the language, and aggressive and insulting attitude you seem to be exhibiting is very off-putting, and I can very much see that (rather than the issues you're trying to raise) being a completely justified reason for a ban.

For the record, I'm very uncomfortable with providing a platform for someone who seems to be claiming they're ok with animal abuse, and I can tell you that we don't tolerate a lot of aggressive or insulting behaviour here; I'd suggest sticking exclusively to the facts and not getting personal if you want to be allowed to stay.

While I think your general message is good ("be careful with licensed assets"), we don't condone the particulars of your message.

Please refrain from engaging in similar tone here at GameDev.net. We are a moderated community and do not tolerate that kind of behavior or tone.

None of this has anything to do with the Linux community.  If you have a licensing related problem with the contents of that person's asset package maybe you should report the issue to the administrators of opengameart.org?  Sorry, I just can't follow the logic that leads this back to Linux or the Linux community.

This is from the description of that asset package..

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 I've been working on this GUI for hobby and I want you to use it!, it's inspired by Blizzards game, Diablo. Hope you guys like it and feel free you use it in anyway :).

Are you sure you aren't just seeing intentional similarities?

3 minutes ago, NikitaSadkov said:

In fact, people in Russia don't understand other language beside a good old punch into the face.

I can't speak for people from Russia, but using that sort of tone and language when interacting with people from the US/UK/Australia/etc. is generally considered childish and impolite; how an angry teenager might communicate rather than an adult.

Perhaps something to keep in mind when interacting with communities of predominantly western peoples.

34 minutes ago, NikitaSadkov said:

I have seen people using such tone in numerous popular Youtube videos

Yes, and the people in those videos and comment sections are generally considered to be rude and immature, and are generally not taken seriously. You don't want to be like those people if you want to be respected and communicate a serious message.

The behaviour of rap subculture is not something you should apply to society as a whole; what's considered ok amongst artists and fans of a particular genre of music is not necessarily considered ok when trying to have a serious adult discussion of intellectual property.

Furthermore, addressing your original point, you continually refer to "the linux community" but provide examples from communities with no relation to that group.  OpenGameArt is not "the linux community".  Battle For Wesnoth is not "the linux community".

As a moderator of a similar community I can tell you that the aggressive and insulting communication, and apparent animal abuse (rather than your actual message about intellectual property) is almost certainly why you have been banned from numerous communities.