There is no evidence to suggest that David Hilbert, a renowned mathematician, thought of Albert Einstein as a poor mathematician. In fact, Hilbert held Einstein in high regard and recognized the significance of his work.
Einstein and Hilbert had interactions related to the field of general relativity. Einstein published his theory of general relativity in 1915, presenting a new understanding of gravity. Hilbert, independently of Einstein, also worked on the mathematical formulation of the theory and published his own paper shortly after Einstein's publication. There was a dispute regarding the priority of discovery between Einstein and Hilbert, which was eventually resolved in favor of Einstein.
While there was some initial controversy surrounding the credit for the development of the field equations of general relativity, there is no evidence to suggest that Hilbert considered Einstein a poor mathematician. Both Einstein and Hilbert made significant contributions to the understanding and mathematical formulation of general relativity, and their work continues to be celebrated in the scientific community.
It's worth noting that Einstein's approach to mathematics differed from that of many traditional mathematicians of his time. He often relied on physical intuition and conceptual reasoning rather than rigorous mathematical formalism. However, this does not diminish his mathematical abilities or the profound impact of his work. Einstein's unconventional thinking and his ability to bridge physics and mathematics were essential in revolutionizing our understanding of the universe.