I'd just be glad they're interested enough to stick around and ask! Instead of running off screaming Glock! Glock! Glock!
I carry a Glock 27 because it's a good fit, is reliable and the price was right (good deal used). For 36 years (most in AZ) I carried a Colt 45ACP Series '70 but had to acknowledge the increased capacity of a still large and potent caliber. So I too have added to the common perception you've experienced.
Nothing wrong with other semiauto handguns but when people see polymer and "ugly" Glock comes to mind! This is due to the huge percentage of Glocks in law enforcement, civilian use, movies and media.