Once I bought some cabinets there that were on clearance, and it took 45 minutes and four different employees before they found someone who knew how to arrange delivery - and payment - of said cabinets. That's right, the first three employees didn't even know how to ring in my purchase.
Anyway - this one time I went to look at tiling supplies and had some questions about the surface I was tiling. There were two! Two! people in the tile aisle so I asked one for some advice.
Me: "Excuse me, I have a question about what product I should use to lay my tiles."
Tile Guy: "Sure, what do you need?"
Me: "Well, I'm tiling on a concrete surface, but I've removed old lino and there may be some residue on the floor, so I'm wondering about adhesion and---"
TG, prancing off to talk to someone he knew: "HEEEEEEYYYYYYYYYYYYYYY MAN HOW'S IT GOING?? Yeah yeah, you got everything you need? Need anything else? Yeah dude, cool man, COOOOOOL!!!"
Me: "But...I was....in the middle of a sentence..."
And there went tile guy, high-fiving and slapping hands with someone all the way at the other end of the aisle, interrupting me in the middle of my sentence and literally walking away.
I really am patient with stores that are short-staffed; in many cases I know that there aren't even experienced staff available to train new staff, so newer employees often aren't knowledgeable about products or where to find certain things. But please - it's common courtesy to let someone finish speaking, especially when the employee has offered to help. It's harder to blame bad manners on insufficient training.