When people making it obvious they are defending something they know nothing about

Often I suspect many of the left wing middle class people who try to debate with me do so without understanding what they are debating. Today I have had a few post comments to me with the results that they seem to be defending something they have zero understanding of. In this thread this person shows us they have no facts and even try to get me to Google the facts (I knew the facts I just wanted to see if they did). In the end they did a Google but still failed to understand that Black Boy was the name of King Charles II. Bizarrely in the end this person informs me that I am a racist. Please provide proof I am racist. They even rant on about pics being on the street sign. I had to explain they only have words on street signs. In the end I just felt embarrassed for this person.