also racism has always been there even if people didn't know how to describe it properly
While this is true people didn't necessarily see other as equal, the concept of categorizing human by race and therefore oppressing them is a very new thing. (around 4 centuries ago)
People were aware of difference of skin color, but they didn't act because of them.
Before that, the reason to categorize people were diverse (socials status, different ethnogroups, level of education, status in society etc.). The categorization were the result of the context (such as the fact that some people were considered barbarian because coming from a native tribe for example in the colonization), but that had nothing to do with the skin.
The concept of racism was developped very recently with scientific racism. Where people started to research and categorize others based on their color of skin or ethnicities in a documented and pseudo-scientific way.
Systemic racism is not natural, its a social construct. Completely isolated people coming in our society today would have absolutely no reasons to be racists. (But they would get racist bias with time by social contact)
Sadly, systemic racism has infected each strats of our society today, so to get rid of it is a hassle and must be done directly on the system itself.
But these conversations are happening and instead of shutting them down they should be addressed to identify the reasons for their existence.
Indeed. That's what I'm doing. I'm not shutting down the conversation (I can't do that) I'm telling people the problem in having the conversation in the first place. Some conversations cannot elevate the debate.