I try to keep my car out of sight at work just to avoid comments like that. There is an upper parking lot and not very many people park up there so that is where I hide my car. Great for avoiding door dings too.
BTW-I picked up a 2017 AMG C63 Cabriolet recently. I fricken love this car! Notice the complete lack of other cars nearby? I took this pic at my work.
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My boss drives a Mercedes though so he understands. There are some nice cars here for sure but most drive econo-cars, SUVs or shit boxes.