这段英文有一句看不明白，请大家帮我翻译一下，谢谢

Question

I called on customers for Johnson and Johnson in the Massachusetts area. One account was a drug store in Hingham. Whenever I went into this store I would always talk to the soda clerk and sales clerk for a few minutes before talking to the owner to obtain his order. One day I went up to the owner of the store, and he told me to leave as he was not interested in buying J&J（这个词应该是印刷的错误，无视它） products anymore because he felt they were concentrating their activities on food and discount stores to the detriment of the small drugstore. I left with my tail between my legs and drove around the town for several hours. Finally, I decided to go back and try at least to explain our position to the owner of the store.
……
文中“because he felt they were concentrating their activities on food and discount stores to the detriment of the small drugstore"一句有点看不明白，请大家帮我解释解释。
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谢谢大家。

Answer 1

解释：
因为他认为，那帮家伙全力进军食品店和打折店，对兼营杂货的小药店形成了冲击。

误解：
J&J并非印刷错误，而是指上面那家公司（Johnson and Johnson ）的缩写。

Answer 2

因为他觉得他们是集中在食品和折扣店他们的活动，损害了小药店

Answer 3

因为他觉得他们是集中在食品和折扣店他们的活动，损害了小药店