Don't feel like you've been singled out, because they are like that with most customers especially in the RC car dept.
I go there when I am so desperate for a part and they have it in stock. If it's not about helicopters, planes or nitro cars your pretty much out of luck. Most of the time the customers are more knowledgeable then the staff. I can't tell you how many times I've stood at the counter which seems forever and not get any help. They seem to cycle through employees like their inventory and not very well at that.
Yes, it's a crapshoot when you go there but most people know this from experience.