Why did Elliot feel uncomfortable with Ben?

Elliot felt uncomfortable with Ben due to his manipulative behavior and the way he exerted control over situations. Ben's tendency to belittle others and his dismissive attitude made Elliot wary of his intentions. Additionally, Elliot sensed an underlying tension in their interactions, which heightened his discomfort and led him to question Ben's motives. This combination of factors created an uneasy dynamic between them.