I think the comment meant to point out that these humorous take on a tragedy are only accepted as part of a russiophobic perspective. I tend to agree, although I don't find it offensive I understand that similar comments on for example, the killing of a ukranian ballet dancer, would be seen differently by all of us. Hence, the xenophobia. Ukranian is western and we relate.
"The last thing a fish notices is the existance of water"
Just changing the victim nationality makes it palatable for jokes, that's something that calls for observation
But also, let's not be pedantic. A nation can be discriminated against, any group of people can be. That's what they meant by racism. They used it more broadly and that's ok, I'm sure even you understood what they meant. What term would you use to be more precise?
You need to update your vocabulary comrade. There may be new definitions of the word racism. Remember literally no longer only literally means literally. What a time we live in.