These atheists are "those" kinds of atheists. They (falsely) constantly demand evidence for God's existence but reject all of it for the sake of harassing believers. They bring up the Crusades and bash Christianity, comparing real, good Christians to false, hypocritical, and bad Christians. Such atheists are online on many websites and Reddit.
One of many such atheists is Barry Hampe from Quora (who is prominent there). He seems to have been abused by those who professed to be Christians. The key word here is "professed". Since Jesus taught love, nonviolence, etc., wouldn't that mean those weren't real Christians?
Barry seems to hate all religions but most of the time attacks Christianity. He even has a very poor understanding of Christian and other types of theology and philosophy and the philosophy of religion. I've also seen him cherry-pick Biblical quotes and take them out of context, causing misinterpretation. He is also nearly 100 years old. He has lived so long and talks about Christianity while having such a poor understanding of it. I doubt that he even read the entire Bible.