Why are atheists so arrogant and mean-spirited?

[widegiraffe286]

There is a group at my college called that Secular Student Alliance, and there was one day called "blasphemy day" where they wrote on the sidewalks in chalk different things that mock Christianity, much of which was extremely hurtful. Another time, I peaked into their Facebook page, and they were talking about going to the national day of prayer and showing up in Wizard costumes and were going to hold up stupid signs saying things like "National Day Of Spell casting" and the leader suggested that they have a "prayer competition." I just feel like they are not open minded towards others, and that really saddens me that atheism is just a bunch of ignoramuses claiming that everyone else is wrong.