I'm not sure I would complain that someone was asking if I needed help with something in a bike shop. Of course a rotten attitude towards it is going to put your butt in a shop that probably has crappy customer service. Maybe you were looking around curiously or maybe you looked lost...? That will get a good employee to ask if you need help with something. If they don't bother you at all, they likely could care less about your needs.

But, to each their own.