With the growing popularity of online shopping...though it will be interesting to see how long it lasts if our government passes the online sales tax bill...brick and mortar shops have to be creative to get and keep customers.
I dislike rude customers and rudeness gets my standard respect unlike the extra help and advice I give not rude customers.
We not longer do "quick repairs/adjustments" for free as we once did except for our regular customers that actually buy stuff at the shop. We will not bump bikes in line to satisfy someone that comes in with an online purchased part and "needs it installed today". We put our regular customers first.

But I've also been treated rudely in mom and pop shops and never hesitate to give it to them both barrels and let them know rudeness is repaid with money spent at their competitors shops or online. If you want my money and business treat me with respect.