No, atheists, as a group, do not inherently get angry when they see a large family. Atheists, like any other diverse group, have a wide range of beliefs, attitudes, and reactions to various situations. Just like with any belief system or non-belief system, individuals' feelings and reactions are influenced by their personal experiences, values, and perspectives.
It's essential to remember that atheism, by definition, is simply the absence of belief in gods or deities. It does not dictate specific emotions or opinions towards families or any other aspect of life. Atheists, like anyone else, can have their reasons for their feelings, whether positive, negative, or neutral, when encountering a large family.
Some atheists might appreciate the sense of community and support that comes with a large family. Others might have concerns about overpopulation or the environmental impact of large families. Still, others may feel indifferent, not basing their feelings on the family size but rather on the individual's behavior and values.
It's crucial to avoid making broad generalizations about any group of people, including atheists. People's feelings and attitudes are complex and can vary significantly from person to person, regardless of their religious or non-religious affiliations. It's always best to treat each individual as just that—an individual—and be open to understanding their unique perspectives and experiences.