Ask HN: Are there colorblind people here? what are your challenges?

Are there colorblind here? I am a red green colorblind. The bar head of hacker news is unreadable to me right now (actually i can read it, but after I focus my sight on the black text a little bit more) and it made me wonder. For colorblind people here what is usually your challenge in everyday life? For me when I was in school and university when the teacher or lecturer are a kind of a hip person and use a colorful presentation some of the slide would be difficult for me to read. And is this kind of color deficiency regarded as a disability in your place?