Einstein's exact words regarding the offer to be President of Israel were not "I prefer to deal with numbers. I am not good at dealing with people." This quote is a popularly attributed statement to Einstein, but there is no concrete evidence that he made such a remark in the context of rejecting the offer to be President of Israel.
While Einstein was certainly known for his brilliance in mathematics and his scientific achievements, it is important to be cautious when interpreting quotes that are not verifiably attributed to him. Einstein did express his preference for working with abstract concepts and scientific principles rather than engaging in political or administrative roles. However, it would be a stretch to assume that his statement implied that people are generally unreasonable or stupid.
Einstein had a deep interest in social and political matters, and he actively engaged in advocating for various causes. He held strong beliefs in human rights, pacifism, and the pursuit of knowledge for the betterment of society. It is more accurate to understand his statement as a reflection of his personal inclination towards scientific pursuits rather than a general judgment on people's intelligence or reasonableness.