Take the comments for what they express. They are wishing you well. Very few are going to help you cut the grass. Accept what you get.
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Although some of the time the ‘thank you’ is said in a perfunctory manner, its still nice to hear it. Especially when said in connection with a veteran’s store discount. :)
There are times related to that that tells me by tone and delivery that the message is intended to be just the opposite but someone in management may be watching/listening. It used to bother me until I realized that my existence was pissing off another loser without me having to put any special effort into it. Now I relish those moments as I walk out to the car.