* "Cotton to" means to be interested in or agree with something. It's a somewhat old-fashioned phrase.
* "Sales side" refers to the department or role involved with selling products or services.
Therefore, the sentence "never did cotton to sales side" means the person was not interested in or did not enjoy working in sales.
Here are some alternative ways to express this meaning:
* "I never liked working in sales."
* "Sales was never my thing."
* "I wasn't cut out for sales."
* "I never had any interest in the sales side of things."