Someone calling you a shithead doesn't make you a shithead, simple as that.

People not having a slightest idea about what people in Russia would think about what they assume by "right wing" won't help Russian people at all, they would only confuse themselves.

The reason, though, is that by telling other people who has no idea about how Russia works to note how another Russian person is bad by their standards (also doing no work to actually research and confirm that) will only make it much less likely for any Russian person to be liked or accepted by the rest of the world. Not because they are really that bad or stuff, but because of only high probability of people getting misled by crap articles and Kremlin propaganda and then refusing to do proper research.

didn’t come from Westerners, but rather from Russians who complained

If you read the article and do some research it really comes from either Kremlin propaganda or people not knowing who Navalny really is.

his anti immigrant stance, equating immigrants to „cockroaches“ or dressing as a dentist and making a metaphor that immigrants were a pain that needs to be removed

And? You don't know that about 70% of Russian population use much more cruel words about immigrants every day? You don't know that there is a real problem with salaries in Russia that could be affected if Russia required proper visa from immigrants (something that a lot of other countries already do but you seem to not complanin about their immigrant stance)?

If you assume a politician who did and said that much as Navalny towards immigrants will do some real unimaginable shit towards them if he gets power... I think any Russian will tell you that you are wrong.

You pretend like nationalist authoritarianism is a phenomenon exclusive to Russia

Excuse me what? Where did I?

Your situation is not unique and if you support a fascist you get fascism.

1. I know Russia's situation is not unique. That said, Navalny is unique as a political person still.

2. Surprise, you already have fascism in Russia even without Navalny. And there will be much more as long as Putin (at least) is in power.

Not that I hope that Navalny will at some point will get any power to do anything. But people lose too much when they judge others by single episodes from their past (that aren't even getting interpreted properly, heh).