A lot of them on Reddit, they even go through the trouble of censoring the flags before they post them.

I'm not a reddit aficionado so I googled "reddit ukraine", which landed me on "r/ukraine" and I went through the first page. The only nazi-like symbol is worn by a bear depicted as a caricature of Russia, on this post: https://www.reddit.com/r/ukraine/comments/xfqauu/go_away_rus...

How do I see "a lot of them"?

I believe they're referring to this removed thread that was on the Reddit frontpage 2-3 days ago: https://www.reddit.com/r/pics/comments/xdgv20/chechen_and_uk...

The thread has over 33k upvotes but has since then been removed by its author. You can find the original image online by looking up the url on webarchives.

The image shows mercenary fighters holding flags in front of a landmark. There are two Chechen flags, one flag depicting a skull associated with a certain ideology and one censored flag.

Search "Nazi patch Ukraine" or some variation on Twitter. I'm not exaggerating when I say that there's hundreds of examples - many of them posted by the BBC, Reuters, or Zelensky himself.

A lot of them are taken out of context see:

https://www.youtube.com/watch?v=Mhg8AXXHoRE

I did find some photos of supposedly nazi-symbol-wearing Ukrainian solders but I didn't recognize the symbol before reading the explanation, maybe they didn't too?

Also, I found some photos of Russian soldiers wearing such symbols too:

https://www.businessinsider.com/russia-fighter-neo-nazi-symb...

If you want to look more into the Russian equivalent of those symbol-wearing soldiers, the Russian soldier in the second link also wears a patch belonging to the 'Rusich DShRG' group